3 Different Levels Coarse - 9 replacement rollers include 3 different levels to meet your hard skin removal needs. Extra Coarse effectively removes even the toughest hard skin. Regular Coarse softens and smoothes ordinary hard skin. Soft Coarse provides a finishing touch and is ideal for daily maintenance. Safely and Effectively - These replacement rollers feature a curved design that fits the contours of your feet. Long-lasting diamond crystals and micro-abrasive particles help remove hard, rough, cracked, dry, and callused skin, leaving feet feeling soft and smooth. Application - These replacement roller heads are compatible with Scholl Velvet Smooth Express Pedi and other electronic foot file devices. Easy to Install - Simple one-click installation. Replace the roller when it becomes less effective. Suitable for soft, hard, dry, and sensitive feet. Durable Performance - Designed for long-term use, these refill rollers provide consistent results and reliable performance for regular foot care maintenance.