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TWSBI Diamond Mini AL Fountain Pen

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Pocket sized, piston fill perfection. Ideal for popping in your bag or laptop case, this little fountain pen extends to full length when the cap is posted. The striking diamond faceted barrel prevents your pen from rolling off the table, whilst the transparent construction allows you to see the piston fill workings and remaining ink levels. Finished with a screw-close cap and rubber O-ring to prevent leaks and drying, the TWSBI MINI will become your faultless travel companion.

All TWSBI fountain pens can be disassembled for cleaning and maintenance. TWSBI includes the tools to do so, but recommend this is only carried out by experienced fountain pen users. This should only be carried out as part of long term servicing of the pen; it will not need to be done straight away. All disassembly is carried out at the owners risk!

Key Features

  • Transparent body and cap with chrome trim
  • Piston mechanism finished in polished anodised aluminium
  • Polycarbonate construction creates scratch resistant, resilient and crystal clear finish
  • Diamond faceted barrel
  • Stainless steel nib
  • Twist action piston fill mechanism
  • Pocket size pen, extends to full size when cap is posted
  • Screw close cap
  • Screw closure on barrel end helps cap stay in place while posted
  • Rubber O-ring prevents leakage and drying
  • Presented in TWSBI gift box
  • Lifetime manufacturer warranty
  • Dimensions (closed): L 120mm x D 12.5mm
  • Dimensions (posted): L 142mm x D 12.5mm
  • Weight: 20g
This is why people love it

Loads of good customer reviews submitted through feefo

Written on 12-Feb-2023
Written on 28-Sep-2019
My second Twisbi mini, that’s how much I like them.

Delivery Information

All orders placed before 3pm Mon-Fri are despatched the same day (except on a bank holiday), even if your order has personalisation. Orders placed after 3pm, at the weekend or on a bank holiday are despatched next working day.

UK: We use a Royal Mail tracked service. Standard delivery is free (£2 charge for orders under £10) and takes 2 to 5 working days, Premium is £3 and takes 1 to 2 working days. Next working day is £6 and is delivered by 4pm (requires a signature).

International: We deliver worldwide with a standard and express service. Please visit our international website

Returns Information

Please return any unwanted items within 21 days of purchase to be eligible for an exchange/refund. The item must still be in a re-saleable condition and returned with proof of purchase. Items that have been personalised cannot be returned unless they are faulty.

Should you receive a damaged or incorrectly dispatched item, please inform us within 7 days of receipt, so we can advise you on the return of the item. Call 0208 731 8610 or email If a faulty or incorrect item is returned, we will refund your postage up to the cost of 1st class recorded Royal Mail. If you are sending items from abroad, please call us for a delivery quote

TWSBI was named for the Chinese phrase “San Wen Tong” (Hall of Three Cultures). These initials were reversed (TWS) and "Bi" added (literally meaning writing instrument) to create the TWSBI name

Specialising in innovative in-built mechanisms for quicker, easier filling

This is why people love it

Loads of good customer reviews submitted through feefo

  1. Written on 12-Feb-2023
  2. Written on 28-Sep-2019
    My second Twisbi mini, that’s how much I like them.
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