I went to this Beauty Exhibition 2 weeks ago and they had this nail competition going. As a newbie, I was very curious and nosey and tried to pickup as much as I can from the pros. One item that caught my eye is the nail file that the nail tech used to file under the free edge to clear/polish off gel material that's gone under the free edge. I've looked at different suppliers for this particular file which is like a square stick about half inch in diameter and about 4 or 5 inches long and seem to have similar quality to a very fine pumice stone but haven't seen anything similar. Has anyone used/seen this product?