UV-resistant ink that's water and scratch-resistant

8 cm x 21 cm)

whatever you're running

calligraphy pen

and it can be changed too

pilot frixion refill patron 0 5 mm 3 pack Week UV-resistant ink that's water andThis 3 pack Pilot FriXion Ball gel ink refill replaces the ink cartridge in any standard FriXion Ball, FriXion Clicker, or FriXion Pro pen body, giving you three extra fine 0. 5 mm gel ink cores in one pack, all in the same color. Each cartridge is filled with Pilot's thermo sensitive gel ink: writing applied to the page can be erased completely using the friction tip built into FriXion pens, which generates enough heat around 60C to turn the ink