Replacement Blades: PF253 - 4/pkgNEWER, SAFER, BETTER Ceramic box cutter with automatic retracting ceramic bladeDouble-sided ceramic blades last 10x longer than traditional metal blades, less blade changesAdditional blades are easily accessible via the back of the handleCeramic blades rounded tip design makes them safer to use then traditional metal bladesUnique handle grip protects your hands, increased safety with fewer injuries