【Different Rough Surface】 Includes Extra Coarse and Regular Coarse black abrasive paper refills, comes with 50 pcs Extra Coarse and 50 pcs Regular Coarse replacement pads , 【Refine & Smooth Feet】 Easiest way to remove the calluses and old cracked foot skin, the rough sandpaper surface was removed with stubborn dead skin, keratin, and fine sandpaper to help refine and smooth the feet