Check the listing for details. 1 Bags 2 Pcs Dental Niti Reverse Curve Rectangular Arch Wires U/L Super Elastic. Condition: New. Listed at 1.89 USD. Feature:Super Ductility and Strength Combination, Suitable for Various Complicated InstanceWith Constant Elasticity, the Curative Effect is More RemarkableAdvanced Surface Smooth Process Brings Long Fatigue Life Use: For dental orthodontic treatment Material: NITI Alloy 1 bag contains 2pcs.Package: 2pcs/bagSize Option:0.016x0.016 upper, 0.016x0.016 lower0.016x0.022 upper, 0.016x0.022 lower 0.016x0.025 upper, 0.016x0.025 lower 0.017x0.022 upper, 0.017x0.022 lower0.017x0.025 upper, 0.017x0.025 lower 0.018x0.018 upper, 0.018x0.018 lower 0.018x0.022 upper, 0.018x0.022 lower0.018x0.025 upper, 0.018x0.025 lower0.019x0.025 upper, 0.019x0.025 lower 0.020x0.020 upper, 0.020x0.020 lower 0.021x0.025 upper, 0.021x0.025 lower 0.014x0.025 upper, 0.014x0.025 lower Attentions:One pack just include one size, not mixed pack.Package list: 1 bags 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, I will verify your status as an authorized purchaser of this item before shipping of the item.