- NiTi Closed Coil Spring is ideal for cuspid retraction and closing extraction space. - The low force, long-acting properties of the Nickel-Titanium Closed Coil makes for an ideal force application when sliding one cuspid along an archwire activated a small amount. - Greater activation of the coils results in higher forces that can be applied to closing extraction spaces with sliding mechanics. **For further product information, please contact Chat Support**