Home Guides Pens Ballpoints OHTO GS01: The Aluminum Needle-Point Ballpoint OHTO GS01: The Aluminum Needle-Point Ballpoint Compiled from 10 sources; we haven't tested this product ourselves yet. How we research
Quick answer The OHTO GS01 is a retractable all-metal ballpoint with an aluminum barrel that turns from hexagonal to round. OHTO lists it at 136.4 mm long and 10.1 mm across, with a 0.7 mm needle-point PS-107NP refill in low-viscosity oil-based ink. It takes Parker-style G2 refills and is made in Japan.
The silver GS01 at 136.4 mm, drawn to scale. Product facts Product OHTO GS01 retractable ballpoint pen, 0.7 mm, silver (GS01-S7-SV) Brand OHTO Brand origin Japan Made in Japan* Material Aluminum barrel, brass tip cone and knock, steel (SK) clip Released March 2021* Price range $$ $5–20 per pen (multi-packs divided by the count) Colors Blue
Rate it ★ ★ ★ ★ ★ No ratings yet. Be the first to rate this product. Notes on these facts Made by OHTO Co., Ltd. (Japan). Made in Japan: OHTO's Japanese product page for the GS01-B7 says MADE IN Japan; Modulor also lists the GS01 (sold there as Grand Standard) as made in Japan. Source . Price: example listing . Released: OHTO's Japanese news list: the GS01 was announced on January 5, 2021 and went on sale in early March 2021. In late October 2026 OHTO Japan released the GS01-B7 under a new code. Colors: names per OHTO (English) , checked October 24, 2026. Colors and item codes per OHTO's English GS01 page. Tints were sampled from OHTO's product photos. Tints are representative, not measured. Shops stock different colors. Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21). Key takeaways OHTO lists the GS01 at 136.4 mm (5.4 in) long, 10.1 mm across and 11.2 mm at the clip; its Japanese site gives 17.3 g. It ships with the PS-107NP refill: a 0.7 mm tungsten carbide ball in a needle tip, with OHTO's low-viscosity oil-based soft ink. OHTO's Japanese site lists the 2026 GS01-B7 at ¥1,000 (about US$6.30) before tax, in black, silver, blue and orange. OHTO announced the GS01 on January 5, 2021, for sale in early March 2021; US importers say it replaced the Horizon Needle Point. OHTO's Japanese product page says made in Japan, and it sells in our $$ band ($5–20) in the US. What is the OHTO GS01?
The GS01 is OHTO’s all-metal click ballpoint: a hexagonal aluminum barrel that turns round toward the tip, a brass tip cone and a 0.7 mm needle-point refill. OHTO is a Japanese pen maker founded in 1919, best known abroad for its fine needle tips and ceramic rollerballs.
OHTO announced the GS01 on January 5, 2021, for sale in early March 2021. Its Japanese site now lists a 2026 version, the GS01-B7, with the same body and refill. The US model code is GS01-S7; the silver one is GS01-S7-SV.
Is the GS01 the same pen as the OHTO Horizon?
It is the Horizon’s successor. US importer Yoseka Stationery says the GS01 joins the body of OHTO’s popular Horizon Needle Point with a new refill, and that the older Horizon models were discontinued.
The visible change is the release: the Horizon had a side button to retract the tip, and the GS01 retracts with the top knock. Many shops still call it the Horizon or Horizon 2021, which is why both names show up in searches.
OHTO GS01 specs
Spec
Value
Maker
OHTO Co., Ltd., Japan
Model
GS01-S7 (US); GS01-B7 (Japan, 2026)
Type
Retractable ballpoint, low-viscosity oil-based “soft ink”
Ball
0.7 mm tungsten carbide, needle tip
Refill
PS-107NP, G2 type, 98.4 × 5.8 mm (3.9 × 0.2 in)
Length
136.4 mm (5.4 in)
Diameter
9–10.1 mm; 11.2 mm at the clip
Weight
17.3 g
Materials
Aluminum barrel; brass cone and knock; steel clip
Colors
Black, silver, blue, orange
Japanese list price
¥1,000 (about US$6.30) before tax
Sizes are from OHTO’s English GS01 page and its Japanese GS01-B7 page; the weight is from the Japanese page. Cult Pens lists 141 mm and 9 mm, but we use OHTO’s figures.
What is the needle-point refill like?
The PS-107NP pairs a long, thin needle tip with low-viscosity oil-based ink, so a 0.7 mm ball writes a finer-looking line with a clear view of the point. OHTO says its soft ink writes smoothly, and Modulor notes the one-piece tip has no plastic adapter, so it doesn’t bend under pressure.
The Well-Appointed Desk found the old Horizon’s needle tip finer than you’d expect from a 0.7 mm ballpoint. OHTO’s own timeline dates its cut needle tip and soft ink to 1999; our OHTO history covers that story.
The G2-size PS-107NP fills about 70% of the GS01's length.
Can you put other refills in the GS01?
Yes: OHTO says the GS01 uses an international-standard G2 refill, the same size as a Parker ballpoint refill. That means gel and hybrid G2 refills from other makers fit as well.
OHTO’s own options are the PS-107NP ballpoint refill and the 0.5 mm PG-105NP Flash Dry gel refill, which OHTO fits to the GS01-G5 gel version. The heavier, gel-only OHTO GS02 uses a ceramic-ball gel refill in the same G2 size.
It’s lighter than a solid-brass pen and heavier than a plastic one, and it costs less than most metal ballpoints.
Pen
Length
Weight
Refill
OHTO GS01
136.4 mm (5.4 in)
17.3 g
PS-107NP (G2)
Parker Jotter 128 mm (5.0 in)
15 g
Parker (G2)
Zebra F-701 133 mm (5.2 in)
about 21 g
Zebra F-Refill
Figures for the other two pens come from our guides to them.
The Jotter is the classic G2 click pen; the F-701 is the cheap steel pen people modify. The GS01 sits between them with its hexagonal barrel and needle tip. Our best ballpoint pens roundup covers the wider field.
Where is the OHTO GS01 made?
In Japan: OHTO’s Japanese product page says MADE IN Japan. OHTO’s head office and factory are in Yuki, Ibaraki, where the company says it makes tips and ink and assembles pens.
Frequently asked questions Is the OHTO GS01 the same as the OHTO Horizon? Nearly. US importer Yoseka Stationery says the GS01 combines the body of OHTO's Horizon Needle Point with a new refill, and that the older Horizon models were discontinued. Some shops still sell the GS01 as the Horizon or the Horizon 2021.
What refill does the OHTO GS01 use? The PS-107NP, a 0.7 mm needle-point refill with low-viscosity oil-based ink. OHTO says it is the international G2 type, so Parker-style refills from other makers also fit.
How heavy is the OHTO GS01? OHTO's Japanese site lists 17.3 g for the current GS01-B7, and Modulor lists 17 g. That is a medium weight for a metal pen.
Can you use a gel refill in the GS01? Yes, any G2-size refill fits. OHTO itself sells a gel version, the GS01-G5, with its 0.5 mm PG-105NP Flash Dry gel refill.
What colors does the OHTO GS01 come in? OHTO lists black, silver, blue and orange for the 0.7 mm ballpoint. The 0.5 mm gel version adds gold and red.
Is the OHTO GS01 made in the USA? No. OHTO's Japanese product page says made in Japan; OHTO assembles pens and makes tips and ink at its factory in Yuki, Ibaraki.
Does the GS01 have a retractable tip? Yes. A click of the top knock extends and retracts the refill; unlike the old Horizon Needle Point, it has no side release button.
Sources (10) OHTO Japan: 油性ボールペン GS01-B7 (MADE IN Japan, 136.4 mm, 9–10.1 mm, 17.3 g, ¥1,000, JAN codes, PS-107NP) OHTO Japan: home page news list (GS01 announced January 5, 2021; GS01-B7 announced October 15, 2026) OHTO Japan: ローラーゲル GS01-G5 (gel version, 19 g, PG-105NP) OHTO (English): GS01 (GS01-S7 colors and JAN codes, 136.4 mm, 10.1 mm, max 11.2 mm) OHTO (English): PS-107NP 0.7 refill (TC ball, 98.4 × 5.8 mm) Yoseka Stationery: OHTO Horizon Ballpoint Ink GS01 0.7 mm (released 2021; replaces the Horizon Needle Point) Yoseka Stationery: OHTO Horizon Needle Point 0.7 mm (discontinued; side release button) Modulor: Ohto ballpoint pen Grand Standard 0.7 (made in Japan, 136 mm, 17 g, materials) Cult Pens: OHTO Horizon 2021 Ballpoint Pen The Well-Appointed Desk: Pen Review: Ohto Horizon Needlepoint Ballpoint (October 2017) More pens guides Parafernalia Divina Fountain Pen: Sizes, Nibs & Colors Price range: $$$Parafernalia Kabrio: Capless Rollerball, Clip & Refill Price range: 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Juice: Pigment Gel Pen, 4 Sizes & 48+ Colors Price range: $Best Luxury Pens (2027): 10 Gift & Heirloom Picks Price range: $$$–$$$$Best Fineliner Pens: Micron, Point 88 & More Price range: $Most Collectible Pens: 9 Modern Editions Price range: $$$$Best Vintage Fountain Pens to Buy (2027): 9 Classics Price range: $$$$Best Ballpoint Pen: Jetstream, Acroball & 10 More Price range: $–$$$Best Brush Pens: Fudenosuke, ABT & Pocket Brush Price range: $–$$Monami Plus Pen 3000: Korea's 0.4 mm Felt Tip Pen Price range: $Kuretake ZIG Clean Color Real Brush: Colors & Blending Price range: $Faber-Castell PITT Artist Pen: Brush Tips & India Ink Price range: $Fisher Space Pen Bullet: Size, PR4 Refill & Claims Price range: $$$Stabilo Point 88: Fineliner Colors, Tip & Dry-Out Price range: $Paper Mate InkJoy Gel: Sizes, Dry Time & Color Packs Price range: $Tombow Dual Brush Pen: 108 Colors, Size, Tips & Blending Price range: $Best Gel Pens: G2, EnerGel, Sarasa & More Price range: $Paper Mate Flair: Felt Tip Sizes & Point Guard Price range: $All pens guides →
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