12/Pack Klever Xchange Replacement Heads KCJ-XH-30 Double Walled Replacement Head For Cutting Double Walled Cardboard and Other Thick Material Safely Recessed Blade Prevents Contact With Fingers, Eliminating Costly Injuries Recessed Blade Prevents Contact With Contents, Eliminating Expensive Product Damage Part Number KCJ-XH-30 (Note: this is the part number only, the listing is for 12 replacement heads) Proudly Made In The USA