This professional art knife with three blades from OLFA is a versatile cutting tool. The addition of a straight (KB4-S), curved (KB4-R), and chisel tip (KB4-F/5) blades provides you with the tools you need for a wide variety of crafting projects. A comfortable rubber grip makes the knife a pleasure to use. To change the blade simply hold onto the rubber grip and spin the shaft. Recommended for use with a base cutting mat.