Large: .31 x 5 inch handle with .438 inch Pounce Wheel /.8 x 12.7 cm with 6.4 mm Pounce Wheel - Creates 14 perforations per inch
Medium : .31 x 5 inch handle with .325 inch Pounce Wheel /.8 x 12.7 cm with 7.9 mm Pounce Wheel. Creates 18 perforations per inch.
Small: .31 x 5 inch handle with .25 inch Pounce Wheel /.8 x 12.7 cm with 11.1 mm Pounce Wheel. Creates 24 perforations per inch.