Ultraedge blades fit all Andis AG AGC AGR+ and MBG Models Oster A-5 and most Detachable-type clippers. Carburized steel extends edge life - adds carbon to cutting edge creating blades that stay sharper longer. Chrome finish resists rust and keeps blades at optium performance. Size 40 leaves hair: 1/100 - 0.25mm. Blade Purpose: Surgical. Fits Models: AG2 AGC2 and AGR. Carbon steel.