Susis Rotary Paper Cutters are self-sharpening. Engineered in Germany to high quality standards. Available in six sizes and are long lasting. They are a great replacement for the old "Guillotine!" Materials that may be cut include: one sheet of newsprint, plastic, laminated, poster board, velum, japanese paper, cork, leather, and thin art aluminum. The cutter will cut a maximun of 8 sheets of 20# bond paper.