... gold, other metals and acrylic plastic material Dental Carbide Burrs1.6mm shank, tungsten carbide material,cross cut.for finishing gold, other ... Numbers, in 190), blue circle, mainly used for scraps area alloy and acrylic - resin3. Fine tooth (ISO Numbers, 140), red ... , the Lord for scraps fragile and difficult to scurf cemented carbide, acrylic - resin and ceramics4. Very fine tooth (ISO Numbers, ...