Oster Cryogen Blades are produced from the finest high-carbon steel and handcrafted to rigorous standards, providing unparalleled precision and performance. Each American-made blade is hardened to RC62-66 (Rockwell Scale C) before receiving a cryogenic treatment to further enhance the hardening process. Oster’s patented Cryogen-X™ process takes the blades down to -300 degrees for a deep freeze, producing a harder, sharper blade which extends the product life. Each blade is then hand lapped for a smooth cut finish. The 15 blade leaves hair 3/64 in making it ideal for close clipping horses or for clipping Setters, Spaniels and Terriers. Compatible with all Oster universal comb attachments and all Oster clippers except the Clipmaster. Clipper blade Made from high-carbon steel American-made Hardened to RC62-66 Patented Cryogen-X™ process Harder, sharper blade Long lasting Hand lapped for smooth cutting finish Ideal for close clipping horses or for clipping Setters, Spaniels and Terriers Leaves hair 3/64 in Compatible with all Oster universal comb attachments Fits all Oster clippers (excluding the Clipmaster)