Professional grade Stainless Steel surface: Its high quality stainless steel double sided file surfaces works instantly to shave off layers of dried callouses. Double sided foot file: Double sided foot file for customizable grooming. For thick calluses, use coarse and finish with fine side. For thin calluses, use fine side only. Mess free experience: Built-in catcher that collects the residue as it falls giving a mess-free experience, allowing quick and convenient cleanup. Simply rinse with running water.