These refill eraser’s fit into the Sharpie Liquid Pencil.
The innovative liquid graphite formulation eliminates the problem of broken pencil leads. This formulation allows users to erase whatever they?ve written for up to 24 hours, after which the liquid graphite becomes permanent. The non-toxic liquid graphite lays down smooth like a pen, but erases like a pencil. It is equivalent to a 0.5mm No. 2 pencil.