[10pcs] - Black coarse × 4, effective and fast for removing thick calloused skin, suitable for rough, callused skin; blue medium × 4, suitable for normal and slightly callused skin; white fine × 2, ideal for daily foot care. [Use with different abrasiveness levels] - Choose the appropriate roller based on the condition of your skin. Use a high-abrasion roller to quickly remove hard, rough skin, then follow with a low-abrasion roller for smooth finishing. [Wide compatibility and packaging] - This product is compatible with Scholl Velvet Smooth, Scholl Velvet Smooth Wet & Dry, and Scholl Velvet Soft devices. [High quality, easy to clean] - Our replacement rollers feature double the abrasive hardness of standard micro-crystal diamond particles, providing durable performance and more effective dead skin removal. Washable materials allow for quick and easy cleaning. [Recommended usage method] - It is recommended to clean the roller head after each use, replace accessories every 10 to 12 uses, limit usage to no more than twice a week, and use each area for a maximum of 3 seconds to avoid skin irritation.