The contoured grip is ergonomically designed for comfort and ease in rotary cutting. Cut up to 15 layers at a time without stress on hands and wrists. Cutter fits in a natural hand position for superb maneuverability, perfect for hands with arthritis, carpel tunnel syndrome, tendonitis or hand fatigue. Available in two sizes- 45mm and 60mm. Available for left and right handers. Blades are exclusive to the Martelli ®Ergo 2000 Rotary Cutters. Cannot use Olfa blades.