Ideal for keeping track of your growing mould collection. Heat you mould and gently write on the mould with the wax nib. It melts easily and does not smear and easy to see. Each pen has one nib & the pack has 6 refills. Clean, Clear, Safe and fun.
Tip: The listo pen yellow top is a screw not a push device. Gently screw it to push the wax out a little. You can dismantle the pen easily to put in new cartridges by unscrewing the lower curved section from the handle.