Using polyester resin, with Shore hardness of 70 D, injection molded Premium-Grade Polyurethane Balls are suited for casters, gears, sprockets, and sporting equipment. Resin exhibits fuel and oil resistance while providing high firmness, tensile and tear properties. Natural color resin meets terms with FDA food-contact regulations 21 CFR 177.1680 and 177.2600, subject to limitations of these and any other applicablemore regulations.