TWSBI fountain pens (top 7)

These are the Top 7 TWSBI pens we'd actually recommend. Nearly all pens are piston filling, using a cartridge-free mechanism to draw ink into the transparent barrel:

1. TWSBI Eco: A great first piston filler, with a large 1.8mL ink capacity, and transparent design. Available in five nibs sizes including an edgy stub nib. Twsbi Eco Sketch Kits are a favourite with artists needing waterproof inks. Use with the cap posted on the end of the pen or unposted.

2. TWSBI Diamond 580: The one we recommend for the 'proper' TWSBI Experience. Large 1.9mL ink capacity, a larger nib, more comfortable grip and interchangeable nib units. Compatible with the Twsbi Diamond Ink Well. The 580 ALR, with aluminium details and textured (ribbed) grip, is the newest model. Use with cap unposted. 

3. TWSBI Vac700R: Loved for its larger overall size, fast vacuum-filling mechanism and huge 2mL ink capacity. Includes ink shut-off valve for travel. Compatible with Twsbi Vac Ink Well. Large #6 nib makes this pen compatible with many other #6 nibs.

4. TWSBI Diamond Mini: A pocket pen for smaller hands. Admired for its compact size, 1.3mL piston-filling mechanism, and portability. Compatible with the Twsbi Diamond Ink Well. Same nib as the Eco. Use with the cap posted.

5. TWSBI Vac Mini: Another pocket pen, but this time with fast vaccum-filling and 2mL capacity. Includes ink shut-off valve for travel. Compatible with Twsbi Vac Ink Well. Same nib as the Eco. Use with the cap posted.

6. TWSBI Classic: A timeless design, with an opaque body, ink window and 1.5mL piston-filling mechanism. Compatible with the Twsbi Diamond Ink Well. Same nib as Eco. Use with cap posted or unposted.

7. TWSBI Swipe: For users who want cartridge/converter flexibility. Same smooth nib as the Eco. Supplied with a large spring converter and large TWSBI ink cartridge. Also compatible with most universal 38mm cartridges, including De Atramentis Document waterproof ink cartridges, which is a popular ink for travel sketching.

Twsbi is the ink machine. With good flow, you can pair Twsbi with any fountain pen ink. We like the reliable Pilot Iroshizuku for Eco, and Sailor for Diamond 580. Except for Swipe, all Twsbi fill from a bottle.

If you need to rescue your Twsbi, we have the spare parts, nibs and caps. The Twsbi Eco nib is friction fit, and is changed by sliding the original nib and feed out, and the new pair in. The Twsbi Diamond and Vac nibs are a screw in nib unit and very easy to change, even if the pen is inked. 

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