Oster Cryogen-X Pet Clipper Blade, 7F Oster Cryogen-X blades are made using a 12 step process that ensures superior Cutting quality The size 7F blade leaves the coat 1/8 Inch without the need for a guide comb Patented Cryogen-X process take the blade to -300o F for extra hardness Hand lapped for aSmooth cut finish Handcrafted in the USA