Tombow - Mini Gas Pen Refill | Medium Black

A smooth-flowing black refill with a medium tip, designed for reliable everyday writing and easy replacement. It pressurises the ink inside the refill in order to allow the writing on all surfaces, submerged in water or writing up side down. Compatible with the following Tombow pens:

• Air Press Pen
• Onbook
• Reporter 4 Compact

A practical choice for keeping your favourite Tombow pen ready for everyday use.