Olfa Rotary Cutters for patchwork and quilting Olfa’s top quality Rotary Cutters will cut fabrics into shapes accurately and efficiently. There are two types, Standard and Deluxe. Both types have a blade cover to protect the blade. The Deluxe version also has a safety lock to prevent the blade being exposed and features an ergonomically designed handle with soft grip to prevent injury and reduce hand fatigue. The sizes given refer to the diameter of the blade.