0.045" arbor diameter, nickel-titanium coil spring fits over any size archwire and delivers gentle, continuous force to distalize molars, without headgear or lip bumpers. Easy to use. Just measure, cut, insert, and use an adjustable archwire lock to reactivate spring from appointment to appointment. Nickel titanium’s long-term memory does the rest. There’s less patient discomfort and no need to rely on patient compliance. 3–7" (17.8cm) lengths allow you to cut only what you need, eliminating waste. Wire diameter is 0.010".