Saivia Professional Manual Ceramic Knife Sharpener - Multipurpose Household Knife Sharpener Stone - Novel Dual-Groove & 2 Stage Sharpening System for Knives in All Sizes, Red Color 2 STAGE SYSTEM - Based on the principle of grinding and cutting, the sharpening bars respectively adopt hard metals and special ceramic to help knife edge restore original sharp quickly. PREMIUM QUALITY - The main body adopts ABS material, durable in use; The handle inlaid with thin stainless steel sheet. The base adopts high grade TPR materials, non-slip and safe. SIMPLE & PRACTICAL - The grinding head is detachable. So you can replace it simply. As long as you lightly pinch its dent and then pull it out; and then push the new grinding head down into the groove. SAVE YOUR MONEY - In tests, this 2-stage sharpening system has managed to bring the dullest knives back to life, no need to spend more money on a new knife set.