Have your choice of a smart-retracting, manual, or auto-retracting utility knife when the complete set from Slice®. The smart-retracting knife features two newest innovations, the "smart retract" technology, and the ergo pull™ slider. The smart retract is advanced to keep you injury-free by pulling the blade back into its housing when it loses contact with the cutting material. Next, cut through a triple-walled knife that is auto-retractable. You'll have a complete set of utility knives using this set from Slice®.