Professional Grade Plastic - Engineered from superior HDPE (high density polyethylene) vs cheap poly that easily warps and cuts. Our poly cutting boards are the best for chefs. Dishwasher Safe - Easy cleaning, holds up to high temperature restaurant dish washers and home units NSF Approved - Certified for food service, this plastic compound resists germs, mold and stains Best For Knives - Unlike wood, plastic is gentle and will not dull or blunt knife edges over time Made by Thirteen Chefs - Maker of professional and gourmet kitchen tools for chefs