Product Description Small as the core of a mechanical pencil "blade (HSS)" with the pen-type "free curve cutter knife" like the core of a mechanical pencil small, with a tough edge at an acute angle, It is the emergence of the pen-type "free curve cutter knife". Has the function of the root of the blade is rotated as round and round and the coma, By the force transmitted to the cutting edge from the hand that holds the cutter, Always it has become a structure that faces the direction in which the blade is advancing cut. Therefore, without having to or re-holding the cutter, It is possible a small shape and cut of the free curve. Size is the length 133.5mm diameter 9mm (not including the blade and cap). The material of the blade is a high-speed tool steel (HSS), replacement blade comes with one.