These knives are made of high-quality stainless steel and feature stylish stainless steel handles. Easily sharpen and hold their edge well. The handle is safe, high impact, slip-resistant as well as antimicrobial and micro-organism safe. The knife is low-temperature resistant and safe to use in the freezer. Always use high-quality steel for your top-quality knives. These sharpening devices are exactly made to match the steel of the blades and guarantee an optimum result. Be sure to maintain a 20° angle from tip to handle over the complete length of the blade. The speed of the process has no impact on the result.