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Quick answer
The uni Jetstream Prime Twist Single is Mitsubishi Pencil's premium twist-action ballpoint, launched in Japan on February 21, 2018. It has a coated brass body about 140 mm long and 30 to 33 g, takes the metal, Parker-style SXR-600 Jetstream refill in 0.38, 0.5 or 0.7 mm, and is made in Japan.
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The Jetstream Prime Twist Single in Black, drawn to scale from retailers' 140 mm length.
Product facts
Product
uni Jetstream Prime Twist Single Ballpoint (0.38 / 0.5 / 0.7 mm; SXK-3000)
$$$$20–75 per pen (multi-packs divided by the count)
Colors
BlackSXK-3000 and SXK-3500, 0.7 mm
Special editions
Ink
black
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Notes on these facts
Made by Mitsubishi Pencil Co., Ltd.. Made in Japan: The Gentleman Stationer (US) and Hunter Paper Co. (UK) both say made in Japan, and unsharpen lists Japan as the country of origin. Mitsubishi Pencil's Japanese product page and press release don't state it. Source. Price: example listing. Released: Mitsubishi Pencil's February 7, 2018 press release gives the Japanese launch date; unsharpen lists 2017. The knock-action Jetstream Prime Single (SXN-2200) came out on October 15, 2014.
Colors: names per Mitsubishi Pencil Japan, checked October 24, 2026. Body colors, models and ball sizes as Mitsubishi Pencil's Japanese Twist Single page lists them (names romanized from its katakana); coral orange is marked limited quantity. All write in black ink. Tints were sampled from Mitsubishi Pencil'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
Mitsubishi Pencil launched the Twist Single on February 21, 2018, as the first twist-action single pen in its Jetstream Prime line, at ¥3,000 (about US$19) before tax.
Retailers list it at 140 mm (5.5 in) long; weights range from 30.3 g (unsharpen) to 32.9 g (Hunter Paper Co.), more than twice a Jetstream RT.
It takes the SXR-600, a metal refill built to the international (Parker-style) standard, in 0.38, 0.5 and 0.7 mm.
Mitsubishi Pencil's Japanese site lists the SXK-3000 at ¥3,300 (about US$21) and the newer SXK-3500 at ¥3,850 (about US$24), tax included.
The Gentleman Stationer, Hunter Paper Co. and unsharpen all list it as made in Japan.
What is the uni Jetstream Prime Twist Single?
It’s the premium, twist-action single-color pen in Mitsubishi Pencil’s Jetstream Prime line, with a metal body and a metal Jetstream refill. You turn the upper barrel to extend the tip instead of clicking a button. Mitsubishi Pencil launched it in Japan on February 21, 2018, at ¥3,000 (about US$19) before tax, in four colors.
The Prime line began in October 2013 with multi pens. Mitsubishi Pencil said the series beat its first-year target in six months, and in 2014 added a knock-action single pen, the Prime Single (SXN-2200).
SXR-600 (-38, -05, -07), metal, international standard
Length
140 mm (5.5 in), per Hunter Paper Co. and unsharpen
Body / grip diameter
10.2 mm / 9.5 mm, per unsharpen
Weight
30.3 g (unsharpen) · about 32 g (Gentleman Stationer) · 32.9 g (Hunter Paper, 0.5 mm)
Body
Coated brass, per The Gentleman Stationer
Japanese price
¥3,300 (about US$21) for SXK-3000; ¥3,850 (about US$24) for SXK-3500
JAN (0.7 mm Black)
4902778231999
Launched
February 21, 2018 (Japan)
Made in
Japan (retailer listings)
Mitsubishi Pencil doesn’t publish the length or weight, so those come from retailers; their weights differ by about 2 g. The 0.38 mm (SXK-3000-38) is newer than the 2018 launch sizes.
The Prime is about as long as a Jetstream RT but slimmer, and more than twice as heavy.
What refill does it use?
It takes the SXR-600, a metal Jetstream refill that Mitsubishi Pencil says follows the international standard. Retailers call it a Parker-style or G2-style refill; unsharpen lists it at 9.8 cm (3.9 in) long. It’s shorter than the plastic SXR-7 that fits the Jetstream RT, so the two refills don’t swap.
Because the format is standard, The Gentleman Stationer says the Prime accepts other Parker-style refills too. Mitsubishi Pencil warns it can’t guarantee quality with other makers’ refills.
How does it compare to the Jetstream RT?
Both write with the same Jetstream ink; the Prime is a heavier metal twist pen, the RT a light plastic click pen.
Jetstream Prime Twist
Jetstream RT
Mechanism
Twist
Click
Body
Coated brass
Plastic, rubber body
Length
140 mm
141.4 mm
Weight
30–33 g
13.8 g
Refill
SXR-600 (metal)
SXR-5 / -7 / -10
Price band
$$$
$
If you want more than one ink in a single pen, see the Jetstream 4&1. For a metal pen at a similar weight with a gel-like rollerball line instead, see the uni-ball ZENTO Signature.
Which tip size should you choose?
Pick 0.5 mm for most handwriting, 0.38 mm for small planners and 0.7 mm for a bolder, smoother line. Jetstream ink is dark, so even the finer sizes read clearly. The number is the ball diameter; the line on paper depends on paper and pressure.
For an even finer Jetstream line, the uni Jetstream Edge uses a 0.28 mm ball.
How much does the Jetstream Prime Twist cost?
In the US it sits in our $$$ band ($20–75 per pen) at specialist shops. It’s an import in most US stores, so prices vary more than for the uni-ball pens sold in office stores.
Where is the Jetstream Prime Twist made?
US and UK retailers list it as made in Japan. The Gentleman Stationer and Hunter Paper Co. both say made in Japan, and unsharpen gives Japan as the country of origin. Mitsubishi Pencil’s own pages don’t state it.
For more Japanese pens across price ranges, see our best Japanese pens roundup.
Frequently asked questions
How long is the Jetstream Prime Twist?
Hunter Paper Co. and unsharpen list it at 140 mm (5.5 in). Unsharpen gives a 10.2 mm body and a 9.5 mm grip.
Can I put a Parker refill in the Jetstream Prime?
Retailers such as The Gentleman Stationer say it accepts Parker-style refills. Mitsubishi Pencil says it can't guarantee quality with refills from other makers.
How heavy is the Jetstream Prime Twist?
About 30 to 33 g, depending on the source: unsharpen lists 30.3 g, The Gentleman Stationer about 32 g and Hunter Paper Co. 32.9 g for the 0.5 mm. Mitsubishi Pencil doesn't publish a weight.
Is the Jetstream Prime Twist made in the USA?
No. US and UK retailers list it as made in Japan. Mitsubishi Pencil is based in Tokyo and sells it in the US under the uni-ball brand.
Is the Jetstream Prime the same ink as a regular Jetstream?
Yes, it's Jetstream low-viscosity oil-based ink, only in a shorter metal refill. Mitsubishi Pencil says Jetstream ink has lower writing friction and about twice the black density of its older oil-based ink.
What's the difference between the SXK-3000 and SXK-3500?
Both are Jetstream Prime Twist Singles. On Mitsubishi Pencil's Japanese site the SXK-3000 costs ¥3,300 (about US$21) and the SXK-3500 ¥3,850 (about US$24). Mitsubishi Pencil describes the SXK-3500 as having a shorter upper barrel and being lighter than the earlier model.
Does the Jetstream Prime Twist come in a click version?
Yes. The Jetstream Prime Single (SXN-2200) is the knock version, launched in Japan in October 2014 with a brass front barrel and a stainless steel rear barrel.
