Problems with arthritis, carpel tunnel syndrome, tendonitis, hand fatigue, neck or arm pain? Then the Martelli ErgoCutter - the only truly ergonomic rotary cutter! Unlike traditional rotary cutters, the Ergo Cutter is held in a natural position with your arm and hand evenly distributing all of the pressure. Cuts round, scalloped, patterned shapes. Blade guard closes with a flip of a finger.