Slice 10512 Pen Cutter, Auto-Retractable Ceramic Blade, Safety Knife, Stays Sharp up to 11x Longer Than Steel Blades Auto-retractable Blade is safely hidden when not in use (Must Hold Rubberized Slider Button While Cutting) Zirconium Oxide Ceramic Blade with Rounded Tip for Safety = Non-Conductive, Anti-Magnetic, Never Rusts, Chemically Inert (No Oil Coatings) + Stays Sharp Up To 10X Longer Than Steel Blades 1 Slice Ceramic Blade = Up to 20 Metal Blades = Less Blade Changes = Less $$$ = Less Downtime = Less injuries + Simple No Tool Blade Change (Replacement SKU# 10404 or 10408) Ceramic Blade only protrudes 1/2" - designed primarily for cutting corrugated packaging, foam, vinyl, boxes, cardboard, etc To cut paper and thinner items please try the Slice 00116 Precision Cutter or 00100 Safety Cutter or use the Pointed Blades 10408