The Grog Buff Proof Ink Squeezer 05 has a 5mm tip which is fit to be used on any writable surface. 
 
Due to its soft plastic body, this marker can be squeezed easily allowing perfect control of ink release. 
 
The Grog Squeezer 05 contains 45ml of Grog Buff Proof ink and it can be refilled as many times as you like.