Wahl® Ultimate Competition Series Blades are designed to cut faster and smoother for great results. Ultimate Series Blades cut 2 1/2 times faster than Wahl® Competition Series blades. #40 blade is a 0.6mm, 3/128" cut length. Ideal for face and ear trimming. Professional high performance blade. Made in the USA. Fits Wahl KM2, Switchblade & Storm Clippers.