Box of 100 Derby Halfblade Blades / Single-Edge Blades. One carton is sufficient for 33 blade changes in the SHAVENT razor The green Derby blades are known as "all-rounders" - they manage the balancing act between a sharp shave on the face and a gentle shave on the body. Over the past 40 years, Derby has always focused on providing its users with the highest quality shave - gentle, comfortable and economical. All Derby razor blades are: * Perforated, hardened and sharpened with the latest blade technology. * Made from high performance stainless steel. * Designed with special coating technology of chrome, ceramic, platinum and tungsten for optimum durability and shaving comfort.