Amazon.com: Slice 10514 Mini Box Cutter, Package and Box Opener, Safe Ceramic Blade Retracts Automatically, Stays Sharp Up to 11x Longer, Right or Left Handed, Keychain, Magnetic, Pack of 1 : Tools
Ceramic 9mm (3/8") Replacement Blade for use with retractable cutter / box cutters - lasts 20 to 30x longer than regular blades
Amazon.com: Cool Hand Zirconia Ceramic Utility Blade, Replacement Blades, Box Cutter, 6 Pcs per Pack, Stanley Knife Good Choice for Unwrapping Parcel Cutting Paper : Tools & Home Improvement