15 Pack 45MM Universal Rotary Sharp Cutter Blades, New 15 pcs blades in a snap closure case wrapped in a 3x5 inch wrapped envelope to protect the case and blades during shipping. 45mm Rotary Cutter Refill Blades. Fits Olfa, Clover, Liabo, Dafa, Fiskar compatible Cuts up to 4 to 6 layers of fabric at a time. SKS-7 Steel material