[20 pieces] - Thick black × 8, effective and fast for removing thick cuticles, suitable for those with hard skin; medium blue × 8, suitable for neutral and hard skin; fine white × 4, suitable for daily foot care.;[Use with different roughness] - Choose the right roller depending on the condition of the skin on the foot. You can use a rolling stick. high roughness to quickly remove hard, rough skin, then use a roller to low roughness for fine grinding.;[Wide compatibility and packaging] - This product is compatible with Scholl Velvet Smooth, Scholl Velvet Smooth Wet & Dry and Scholl Velvet Soft. Note: Not compatible with Scholl Express Pedi.;[Good quality, easy to clean] - The cheapest price, most parts. Our replacement rollers have twice the hardness. micro-diamond crystal abrasive grains, which are resistant to 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, replace it with new accessories every 10 to 50 minutes. 12 times, do not use more than 2 times per week and use the same piece for a maximum of 3 seconds. to avoid skin damage.