, High-Performance Ceramic - Ceramic is harder than steel and is ideal for sharpening knives and tools made of very hard materials that ordinary steel sharpeners cannot. Excellent Wear Resistance - The 3000-grit fine ceramic is extremely and wear-. It polishes and refines the edge of your blades, giving them a - finish. Protective and Practical Design - The removable rubber cover helps protect the from scratches and minimizes chipping and nicks from drops. Ceramic is non-, odorless, and rust-free, making it long-lasting and .