Product Name: Dental Orthodontic Open Coil Springs Features: High resilience and durability Gives comfort while open and maintaining proper spaces with constant force 1.Use: For dental orthodontic treatment 2.Material: NITI Alloy 3.sizes: 0.012* 180mm(also have 0.010*180mm, if you need,pls leave messages) 4.Package : 2pcs/pack, total 10 packs