MARTELLI-Rotary Cutter. This 45mm rotary cutter can cut up to fifteen layers at a time without stress on hand and wrist. Spring loaded guard, easy blade replacement and comfort contoured grip. Cutter fits into the natural position of your hand for superb maneuverability. Perfect for arthritis, carpel tunnel, tendonitis or hand fatigue. Replacement blades can be purchased individually or in packages of five. This package contains one left-handed cutter: also available in right-handed (sold separately). Imported.