Usage Tips:[10pcs] - Thick Black ×4, effective and rapid to eliminate the thick stratum corneum, suitable forwith crusty skin;medium blue ×4, suitable forwith neutral and crusty skin;fine white ×2, suitable fordaily foot care.[Use with different roughness] - Choose the right roller according to the condition of the skin on the foot.You can use a rolling pin.high roughnessto quickly remove hard, rough skin, then use a roller to soften the skin.low roughnessfor fine sanding.[Wide compatibilityand packaging] - This product is compatible with Scholl Velvet Smooth, Scholl Velvet Smooth Wet &Dry and Scholl Velvet Soft.[Good quality, easy to use.clean] -The cheapest price, most parts.Our replacement rollers have twice the hardness of our replacement rollers.micro-diamond crystal abrasive grains, which can withstand harsh conditions.wear and eliminate dead skin more effectively.Washable materials ensure quick and easy cleaning.[Recommended method of use] - It is recommendedclean the sand head after each use, replace it with accessories every 10 to 10 years.12 times, not to use more than twice a week and to use the same part for a maximum of 3 seconds.to avoid skin damage.