Often times with other files, especially coarse black ones, some of the coating comes off and leaves skid marks on the nail — if you know, you know! These don’t have that issue. Here are some nails I did using the pink builder x gel, with the bulk of the shaping done with this file. I was able to quickly get the shape I wanted but most importantly, no skid marks! I was able to let the colour of the builder gel shine through :)