Ceramic Edge™ blades feature a certified zirconium oxide ceramic cutter blade that offers the following advantages: Higher durability, stays sharper longer Cutter runs 75% cooler than steel Feature a smoother, faster cutting feel regardless of length or density Break resistant material Fit on Andis models AG, AGC, AGR+ and MBG, Oster A5 and most detachable-type clippers Size: 40