Usage Tips: [20 pcs] – Thick Black × 8: Designed for effective, fast removal of thick cuticles and hard skin; Medium Blue × 8: Suitable for neutral to hard skin; Fine White × 4: Ideal for daily foot care. [Select by Skin Condition] – Choose the appropriate roller based on your foot skin condition. Use the high-roughness roller first to remove tough, rough skin, then follow with a lower-roughness roller for smoothing. Durable for long-term use. [High-Quality & Easy to Clean] – Made with micro-diamond crystal abrasive grains for enhanced durability and efficient dead skin removal. Washable design allows for quick and easy cleaning. [Recommended Usage] – Clean the roller head after each use. Replace rollers every 10–50 minutes of cumulative use. Limit usage to no more than twice per week. Avoid using the same roller for longer than 3 seconds continuously to prevent skin irritation.