Platinum Preppy: The Slip & Seal Starter Fountain Pen

A black Preppy, cap posted (138 mm capped, per Goulet Pens).

Product facts

Product: Platinum Preppy Fountain Pen (02 EF / 03 F / 05 M)
Brand: Platinum
Brand origin: Japan
Made in: Japan^*
Material: Polycarbonate (PC resin) body, stainless steel nib (ST-27), per Platinum Japan
Released: 2007
Price range: $$$5–20 per pen (multi-packs divided by the count)

Notes on these facts

Made by Platinum Pen Co., Ltd. (Tokyo). Made in Japan: per retailer listings: Hunter Paper Co says made in Japan and Unsharpen gives Japan as the country of origin (both read on October 20, 2026). Platinum's Japanese product pages don't state it. Source. Price: example listing.
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; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).

Key takeaways

Platinum launched the Preppy in 2007 and says it passed 15 million pens sold in April 2024.
Three steel nibs: 02 Extra Fine (added October 25, 2014), 03 Fine (0.3 mm) and 05 Medium (0.5 mm).
Platinum says the Slip & Seal cap keeps a fitted cartridge from drying out for 1 year.
Platinum's Japanese site lists the Preppy at 138 mm (5.4 in) long, 13 mm at the widest and 13 g, in a polycarbonate body.
It launched in Japan at ¥210 (about US$1.30); Platinum now lists it at ¥660 (about US$4.20) including tax.

What is the Platinum Preppy?

The Preppy is Platinum Pen’s clear plastic cartridge fountain pen, made to be cheap enough to buy like a ballpoint. Platinum Pen Co., Ltd. of Tokyo launched it in 2007, and All About reported a launch price of ¥210 (about US$1.30).

In an October 2014 release, Platinum called the Preppy the world’s best-selling ultra-low-price fountain pen, with about 5.3 million shipped by then. It says the Preppy passed 15 million pens sold in April 2024. Both are the maker’s figures.

It’s the cheapest of the starter fountain pens we cover, with the Pilot Kakuno, Pilot Metropolitan, LAMY safari and TWSBI ECO.

Platinum Preppy specs

Spec	Value
Maker	Platinum Pen Co., Ltd. (Tokyo)
Type	Cartridge/converter fountain pen with Slip & Seal cap
Model (Japan)	PSQ-300 (03 Fine, 05 Medium) · PSQ-400 (02 Extra Fine)
Body	Clear polycarbonate (PC resin), per Platinum
Nib	Stainless steel (ST-27): 02 Extra Fine · 03 Fine · 05 Medium
Filling	Platinum cartridge (1 included) or Platinum converter
Length	138 mm (5.4 in), per Platinum; 15.1 cm (5.9 in) posted, per JetPens; Goulet Pens lists 138 mm capped and 154 mm posted (our drawing uses Goulet’s figures)
Widest diameter	13 mm, per Platinum
Grip diameter	10.6 mm, per JetPens
Weight	13 g standard weight, per Platinum; 13.0 g, per Goulet Pens
Japan list price	¥660 (about US$4.20) including tax
Launched	2007
Made in	Japan (per retailers)

Platinum’s Japanese product pages give 138 mm, 13 mm at the widest and a 13 g standard weight, which match Goulet’s measurements. In Japan the PSQ-300 comes in black, blue-black and red in 03 or 05, plus pink, violet and green in 03 only.

At 138 mm capped the Preppy is a full-size pen; for one that fits a jeans pocket, see our best pocket pens roundup.

What do the 02, 03 and 05 nibs mean?

The number is the nib size: 02 is Extra Fine, 03 is Fine and 05 is Medium. Cult Pens gives the 03 as a 0.3 mm line, and the 05 writes about 0.5 mm. Platinum added the 02 on October 25, 2014, at ¥300 (about US$1.90) before tax against ¥200 (about US$1.30) for the 03 and 05. Today all three list at ¥660 (about US$4.20) including tax.

02 Extra Fine: small handwriting, planners and cheaper paper.
03 Fine: the usual first choice; The Journal Shop says it comes in the most body colors.
05 Medium: a wetter, bolder line; best on smooth paper such as a Rhodia DotPad.

Japanese nibs usually run finer than Western ones of the same name, though one retailer says the 05 writes more like a European Medium.

What does Slip & Seal do?

Slip & Seal is Platinum’s sealed inner cap, which Platinum says keeps the ink from drying out for a year. The seal sits inside the cap and closes around the nib when you cap the pen. ASCII’s 2014 review named it the pen’s main advantage: you can pick it up after a year and it still writes.

What cartridges and converter does the Preppy use?

It takes Platinum’s own cartridges, and it comes with one. For bottled ink, fit a Platinum converter, sold separately. Standard international cartridges need Platinum’s international adapter, per The Journal Shop.

Goulet Pens says the barrel can also be used as an eyedropper, filled straight from the bottle, if you add an O-ring and a little silicone grease to the threads.

How does the Preppy compare to other starter fountain pens?

The Preppy is the cheapest and simplest; the others cost more but feel sturdier.

	Platinum Preppy	Pilot Kakuno	Pilot Metropolitan	LAMY safari
Body	Clear polycarbonate	Resin, hexagonal	Brass	ASA plastic
Filling	Platinum cartridge or converter	Pilot cartridge or converter	Pilot cartridge or converter	T10 cartridge or Z28 converter
Steel nibs	02 EF, 03 F, 05 M	EF, F, M	F, M, 1.0 stub	EF, F, M, B, LH, italics
Capped	138 mm	130.9 mm	138 mm	139.5 mm
Made in	Japan	Japan	Japan	Germany
Price band	$$	$$	$$$	$$$

Figures for the other pens come from their guides. In August 2026 Platinum also launched the PREFOUNTE in Japan, a Preppy spin-off with the same Slip & Seal cap, at ¥990 (about US$6.30).

Where is the Platinum Preppy made?

Retailers list it as made in Japan. Hunter Paper Co says made in Japan and Unsharpen gives Japan as the country of origin. Platinum’s Japanese product pages don’t state it.

How much does a Platinum Preppy cost?

It’s in our $$ price band, $5–20 per pen, in the US. It shares that band with the Pilot Kakuno but costs less; the other starter fountain pens we cover are $$$ ($20–75).

Frequently asked questions

What do the Preppy nib numbers 02, 03 and 05 mean?

They are nib sizes. 02 is Extra Fine, 03 is Fine (a 0.3 mm line, per Cult Pens) and 05 is Medium (about 0.5 mm). Japanese nib sizes usually run finer than Western ones of the same name.

What is Slip & Seal on the Platinum Preppy?

It's Platinum's sealed inner cap, which closes around the nib when the pen is capped. Platinum says it keeps the ink in a fitted cartridge from drying out for a year, so the pen writes even after long gaps.

What cartridges does the Platinum Preppy take?

Platinum's own proprietary cartridges, and it comes with one. You can also fit a Platinum converter, sold separately, for bottled ink; standard international cartridges need Platinum's adapter.

Can you turn a Preppy into an eyedropper pen?

Yes. Goulet Pens says the barrel can be filled directly with ink if you add an O-ring and a little silicone grease to the threads, which holds much more ink than a cartridge.

Is the Platinum Preppy good for beginners?

It's one of the cheapest ways to try a fountain pen, and Platinum says it passed 15 million sold in April 2024. The clear plastic body is light but less sturdy than the Kakuno or Metropolitan.

Where is the Platinum Preppy made?

Retailers list Japan: Hunter Paper Co says made in Japan and Unsharpen gives Japan as the country of origin. Platinum Pen Co., Ltd. is based in Tokyo.

What is the Platinum PREFOUNTE?

A grown-up spin-off of the Preppy. Platinum says it keeps the Preppy's basic performance, including Slip & Seal, and launched it in Japan on August 31, 2026 at ¥990 (about US$6.30), after selling it overseas since 2019.

Sources (16)

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