1 pack Dental Orthodontic NITI Open Coil Spring ArchwiresDescription:1. High resilience and durability;2. Gives comfort while open and maintaining proper spaces with constant force;3. Use: For dental orthodontic treatment;4. Material: NITI Alloy;5. English Package;6. 2pcs/pack7. CE approved.All sizes:0.010*180mm;0.012*180mm.one pack just include one size， Not Mixed Pack!