Toothbrush-style brush with 0.006" PEEK Bristle and a Plywood Handle in a curved design for knuckle protection. The PEEK bristle, hand-laced with stainless steel wire, remains secure even in wet environments if the wooden handle expands or contracts. Each fill tuft is tied into position by hand, resulting in a superior quality brush with maximum fiber retention. Greater bristle density than staple set brushes. PEEK (polyetheretherketone) is a high-performance engineering plastic with outstanding resistance to harsh chemicals and heat along with excellent mechanical strength and stability. PEEK bristle has a continuous use temperature of up to 480°F