Tramontina 5 Inches Boning Knife Professional High quality stainless steel associated with efficient heat treatment sub-zero. Polypropylene handle with antimicrobial protection that inhibit odor and stains caused by bacteria, mould and mildew. Certified by NSF, National Sanitation Foundation an internationally recognized organization in the practices of consultancy, inspection and training, aimed at ensuring the health of food, water, air and environment. Dishwasher proof.