[20pcs] - Thick Black × 8, effective and fast to remove thick cuticles, suitable for 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 according to the foot skin condition. Use a high-roughness roller to quickly remove hard, rough skin, then use a low-roughness roller for fine sanding. Durable for long-term use. [Good quality, easy to clean] - Our replacement rollers are made with higher hardness. Micro-diamond crystal abrasive grains provide durable wear resistance and more effective dead skin removal. Washable materials ensure quick and easy cleaning. [Recommended method of use] - It is recommended to clean the roller head after each use. Replace with new accessories every 10 to 50 uses. Use no more than 2 times per week and limit use to a maximum of 3 seconds per area to avoid skin damage. Note: Due to differences in lighting and screen settings, the item's color may vary slightly from the pictures. Please allow slight dimension differences due to manual measurement.