20pcs Set: - Thick (8 pcs): Effective for removing thick cuticles, suitable for tough skin; - Medium (8 pcs): Ideal for neutral and tough skin; - Fine (4 pcs): Great for daily foot care (colors as shown). Use with Different Roughness: Choose the right roller based on foot skin condition. Start with high roughness to quickly remove hard, rough skin, then switch to low roughness for fine sanding. Durable for long-term use. High-Quality & Easy to Clean: Replacement rollers feature micro-diamond crystal abrasive grains with double hardness, ensuring effective dead skin removal and wear resistance. Washable materials allow quick and easy cleaning. Recommended Usage: Clean the roller after each use. Replace with new rollers every 10-50 minutes of use (12 times). Avoid using more than 2 times per week and limit each roller to 3 seconds max to prevent skin damage. Note: Slight color variation may occur due to light and screen settings. Minor dimension differences are possible due to manual measurement.