Slice-Smarty Series Auto Retract Utility Knife: Grey/Green. This knife uses a ceramic blade for sharp and safe cuts. It features a durable glass filled nylon handle and uses an easy, no-tool blade change. The utility knife is ambidextrous, has a built in lanyard hole, and auto retract for safety after cutting. This 6-1/4x3-1/2x1 inch package contains one knife and one replacement blade. Imported.