The Goodman Torquing Springs will stop relapse before it happens! You can apply torque to any tooth from centrals to 2nd bicuspids upper or lower. The springs crimp to any rectangular wire from .016x.022 to .019x.025. You can deliver 125 to 150 grams of labial or lingual root torque to align roots and finish cases faster. To use, the small springs for upper laterals and lower interiors, and large springs for all other teeth..