3 kinds of roughness 5* Coarse black; 3* Medium light blue; 2* Finepink. Different roughnesses can be combined. Gently remove the keratin to treat daily calluses at home. How to use 1First use warm water to soak your feet, soften the keratin. 2Then choose the roller whose roughness suits the skin. 3After removing keratin/dead skin, clean the feet and apply moisturizer. Beautiful PackageThis product is beautifully packaged and can be used with a foot polisher. This wheel set is compatible with Velvet Smooth, Velvet Smooth Wet and Dry, Velvet Soft. Make your feet more charmingSuitable for professional and home use, men/women, feet soft/hard/dry and sensitive.These replaceable rollers make your feet soft and easy to use, instantly making your feet silky soft. Recommended UseWhen the wheel's efficiency is reduced, replace -there. It can be used up to 10-12 times (depending on the intensity and duration of the treatment). Do not peel twice or more per week, and the feet of the grinding equipment should not be in the same position for more than 3S to avoid skin damage.