Treet Carbon Steel double edge blades fit all double edge razors. Treet Carbon Steel blades are made from the highest quality steel. Each Treet Carbon Steel blade provides unsurpassed quality, smoothness and durability for a long lasting, smooth shave. Additional Details ------------------------------ Product description: Treet Carbon Steel double edge blades fit all double edge razors. Treet Carbon Steel blades are made from the highest quality steel. Each Treet Carbon Steel blade provides unsurpassed quality, smoothness and durability for a long lasting, smooth shave.