Check the listing for details. 10pc/Pack Dental Orthodontic Super Elastic Rectangular Niti Natural Arch Wire. Condition: New. Listed at 3.99 USD. 1. 10pcs/pack 2. English Package 3. Used For Dental orthodontic treatment 4. Material: Super Elastic NITI 5. Type: Rectangular 6. CE approved We have sizes of 0.014x0.025 upper, 0.014x0.025 lower 0.016x0.016 upper, 0.016x0.016 lower 0.016x0.022 upper, 0.016x0.022 lower 0.016x0.025 upper, 0.016x0.025 lower 0.017x0.022 upper, 0.017x0.022 lower 0.017x0.025 upper, 0.017x0.025 lower 0.018x0.018 upper, 0.018x0.018 lower 0.018x0.022 upper, 0.018x0.022 lower 0.018x0.025 upper, 0.018x0.025 lower 0.019x0.025 upper, 0.019x0.025 lower 0.020x0.020 upper, 0.020x0.020 lower 0.021x0.025 upper, 0.021x0.025 lower one pack just include one size, not mixed pack. Please tell me the size you need when you buy or pay, or we will send you one size randomly. Thanks for your understanding!