This product is brand new and unused. These are OLFA extra-thick blades (small), with 10 blades per pack, each 0.38mm thick. * These are special black blades with a sharp angle for superior cutting performance, designed for small cutter knives. * They can be used with the "interior professional" cutter knife body for cutting wallpaper. * Packaged in a plastic case containing 10 blades. * Compatible with: Various small blade cutters * Alloy tool steel Blade width: 9mm, Blade thickness: 0.38mm Thank you for viewing.