This .021 x .027 archwire is an ideal finishing wire in Self Ligating Bracket Systems as it completely fills the bracket slot.A heat activated Nitanium Archwire specifically designed for consistent performance and low tooth moving forces, the Bio-Kinetix Thermally Activated Nitanium Archwire provides outstanding resiliency and demonstrates ultimate thermal performance. The archwire is soft at room temperature allowing for easy ligation.Benefits of using the Bio-Kinetix Thermally Activated Nitanium Archwire:Excellent shape integrity and shape memory for a heat-activated archwire.Temperature Transition Range (TTR)= 80-90 degrees F (26.7-32.2 Celsius.)Optimum and consistent performance.Easy ligation at room temperature.Outstanding resiliency.Offers slightly lower forces than the Bio-Kinetix Plus.Ideal for use during cases that have significant crowding.Very responsive to chilling which allows patient to ease discomfort with cold temperature items.Low force provides greater patient comfort, and helps control torque early in treatment.ProForm Arch Shape.Pack of 10.