Martelli's Replacement Rotary Blades are made to be easily replaced for quick blade changes. These blades are made of high-quality steel for durability and longevity. Pair with Martelli’s Ergo Rotary Cutters and cutting mats for a complete ergonomic cutting system. A hard plastic case is included for safe blade storage. Available in 28mm, 45mm, and 60mm with varying pack sizes.