The brush wire materials are divided into four categories: 1 is the metal category: copper-plated steel wire, galvanized steel wire, card clothing steel wire, flat steel wire, copper wire, stainless steel wire. 2 is animal bristles: pig bristles, horse hair, horse tail hair, wool. 3 is plant palm hair: sisal (white brown), mountain brown. 4 is plastic nylon: PP, PA, PET, 1010, 610, 612, silicon carbide abrasive wire, alumina abrasive wire. This is also the main filament material for making brushes.