X3000 Knife is perfect for professional artists, designers and students who need to store their X-Acto blades for easy access. The back of the knife unscrews to store up to five extra No. 11 blades. Built-in storage compartment holds up to five extra No. 11 blades. Textured no-slip grip offers improved comfort during usage. Anti-roll handle helps prevent knife from falling off a desk or table. Designed for delicate, precision cutting, trimming and stripping, knife easily cuts paper, plastic, balsa, thin metal, cloth, film and acetate. Knife comes with three No. 11 Classic Fine Point Blades and a safety cap. Knife can also use No. 10, 12, 16 and 17 blades.