25/Pack Klever X Change Replacement Blade Head for Deluxe Safety Cutters Klever X-Change Replacement Head Compatable With All Klever X-Change Double Wall Blade Used To Cut Thick Double Wall Cardboard, Stretch Wrap, Plastic Banding, Shrink Wrap, Cartons, Bubble Wrap etc. Recessed Blade Prevents Contact With Fingers, Eliminating Costly Injuries Recessed Blade Prevents Contact With Contents, Eliminating Expensive Product Damage