Check the listing for details. Dental Orthodontic Spring Rectangular Anterior Door Torquing Spring 30Pcs. Condition: New. Listed at 10.81 USD. Dental Orthodontic Torque Spring. Package: 10Pieces of (Large+Medium+Small) Total 30pcs. 12 sizes are available as below, any need to replace size,please conact us. 0.016*0.022 Large/Middle/Small 0.017*0.025 Large/Middle/Small 0.018*0.022 Large/Middle/Small 0.019*0.025 Large/Middle/Small Dental Ortho Single Anterior teeth torque spring For control of a single tooth faciolingual inclination Application torque spring before the main arch wire with 0.46 mm x 0.64 mm stainless steel wire. The torque hole through the main arch wire fixed on both ends of the spring, Strength of the single spring torque with crowns are angled lip not to exceed 90°, Strength direction for the direction of the coil spring open. Torque according to need to move in the direction of the torque spring and lever on the gum or teeth braces or tooth crown, Such as the need to move to the tongue palatal side root (positive torque) add in orthodontic bracket arm of gum, Root need to move to the labial side (negative torque) arm placed in braces tooth or party. The routine was rediagnosed around 4 weeks. FDA STATEMENT The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies. If so, do not bid on this item unless you are an authorized purchaser. If the item is subject to FDA regulation, We will verify your status as an authorized purchaser of this item before shipping of the item.