Features: 1. 10pcs/pack 2. English Package 3. Used For Dental orthodontic treatment 4. Material: NITI 5. Technical craft: Thermal Activated 6. Type: Round 7. CE approved Styles and sizes optional： 0.012 (upper/lower) 0.014 (upper/lower) 0.016 (upper/lower) 0.018 (upper/lower) 0.020 (upper/lower)