[10pcs] - Thick black 4, effective and fast to remove thick callus layer, suitable for scabby skin; medium blue 4, suitable for neutral and crusty skin; fine white 2, suitable for daily foot care. [Use with different roughness] - Choose the right roller according to the skin condition of the foot. You can use a high roughness roller to quickly remove hard, rough skin, then use a low roughness roller for fine sanding. [Wide Compatibility and Packaging] - This product is compatible with Scholl Velvet Smooth, Scholl Velvet Smooth Wet Dry and Scholl Velvet Soft.[Good quality, easy to clean] -The cheapest price, the most parts. Our replacement rollers have twice the hardness of micro-diamond crystal abrasive grains, which can resist 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 10-12 times, use no more than 2 times a week, and use the same piece for a maximum of 3 seconds. to avoid skin damage.