The large crystal glass foot/skin file is 7.5 in. in length; it is etched on both sides of file and is ideal for the removal of dead skin (“sandal heel”)/calluses and it never wears out.
The foot file should be used at the end of bath/shower, before drying, no soap, no lotion (could cause file to slip from hand), rub on unwanted skin and no matter how hard you rub, no pain, no soreness (like pumice can cause) and you will see unwanted skin file off and it works just as well dry. They never wear out.