Developed as an alternative to stainless steel archwires, 3M™ Unitek™ Nitinol Classic Archwire continues to provide the linear elasticity and bendability of high-strength steel, and the elastic working range and lighter forces that only a nickel titanium can deliver. For easy wire insertion and engagement, regardless of the appliance system, 3M offers three variations of Nitinol Archwires: 3M™ Unitek™ Nitinol Classic Archwire, 3M™ Unitek™ Nitinol Heat-Activated Archwire, and 3M™ Unitek™ Nitinol Super-Elastic Archwire. 3M™ Unitek™ Nitinol Heat-Activated Archwire is a thermally-activated, super-elastic archwire. It is the easiest of wires to engage, and it delivers light, continuous forces that effectively move teeth.