Fangrui Product Details [5 Pieces] - Heavy Black Andtimes 3, Effective And Fast Removal Of Thick Stratum Corneum, Suitable For Hard Skin Medium Blue Andtimes 2, Suitable For Neutral And Hard Skin.[use With Different Roughness] - Choose The Right Roller According To The Skin Condition Of The Foot. You Can Use A Rolling Pin. High Roughness To Quickly Remove Hard, Rough Skin, Then Use A Roller To Low Roughness For Fine Sanding.[wide Compatibility] - This Product Is Compatible With Scholl Velvet Smooth, Scholl Velvet Smooth Wet Andamp Dry And Scholl Velvet Soft. Note: Not Compatible With Scholl Express Pedi.[good Quality, Easy To Clean. Clean] -the Cheapest Price, The Most Parts. Our Rollers Are Twice The Hardness. Micro-diamond Crystal Abrasive Grains, Which Can Withstand Wear And Remove Dead Skin More Effectively. Washable Materials Ensure Quick And Easy Cleaning.[recommended Method Of Use] - It Is Recommended To Clean The Sand Head After Each Use, To It With New Accessories Every 10 To 50 Minutes. 12 Times, Not To Use More Than 2 Times Per Week And To Use The Same Piece For A Maximum Of 3 Seconds. To Avoid Skin Damage.