[5 Pieces] - Heavy Black &Times; 3, Effective And Fast Removal Of Thick Stratum Corneum, Suitable For Hard Skin; Medium Blue &Times; 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 &Amp; 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 Replacement 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 Replace 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.