This pack of Clover Rotary Blades offers a convenient source of replacements when your rotary cutter s blade becomes dull. The sharp edge cuts through fabric and other material with ease. Each of the Clover rotary cutter blades in this five-pack measures 45 mm and fits inside the Clover rotary cutter (sold separately). Also included is a plastic case for safe and convenient storage. Keep them on hand in your collection of crafting tools for a quick and easy replacement whenever they are needed so you always have a sharp cutting edge.