For The Sable, Topaz, And Fast Feed 23 Clippers, Oster Replacement Blades Are Oster Cryonyx Collection Blades 17 Teeth The Hardest Clipper Blades Ever - 20 Cooler For All Oster Topaz, Sable, Rocker, Speed Line and Fast Feed Clippers Fits Models: 23-54, 30-31, 23-31, 56-31 23-51 Size from 000 to 1 Cut 1/100" to 3/32" (0.25mm to 2.4mm) 076913-806 Blades Are Scratch and Rust-Resistant Made in USA The blade adjusts from very close cutting (Size 000) to medium length (Size 1). Oster uses cryogenic technology to create the hardest blades ever. Cryogenic processing conditions metal to 300 degrees below zero, so molecules are aligned in a perfect structure. The result is a harder, denser metal that holds a sharper edge through prolonged usage. A5 Cryogen-X Blades also withstand more sharpening treatments for unsurpassed longevity. Sharper blades glide through coats with less effort, saving you and your clipper from unnecessary fatigue and wear. Cryogen-X Blades are manufactured from fine-grain, high-carbon steel that is cryogenically treated. With a Rockwell Hardness rating of 62, these durable blades were designed with the busy groomer in mind. Blades stay ultra cool for optimum durability. Size from 000 to 1 Cut 1/100" to 3/32" (0.25mm to 2.4mm) Oster Cryonyx Black Collection Blades 17 Teeth The Hardest Clipper Blades Ever - 20 Cooler For All Oster Topaz, Sable, Rocker, Speed Line and Fast Feed Clippers Blades Are Scratch and Rust-Resistant - Made in USA