Tungsten carbide cutters for dental laboratories. Plain cut are for precious metals and acrylics. Cross Cut coarse are for Cr Cobalt, precious metals and acrylics. Cross Cut fine are for precious metals and ceramics/porcelain. Cross Cut extra coarse are for acrylics. Black - extra coarse for plastics and gypsum. Green - coarse for shaping plastic and gypsum. Blue - medium for all dental materials. Red - fine for all dental materials. Yellow - extra fine for alloys, composites and ceramics. Violet - superfine for preparing and contouring titanium.