Introduction 1.10pcs/pack 2.English Package 3.Used For Dental orthodontic treatment 4.Material: NITI 5.Type: Rectangular 6.CE approved Technical craft: Thermal Activated We have sizes of 14x25 ( upper / lower ) 16x16 ( upper / lower ) 16x22 ( upper / lower ) 16x25 ( upper / lower ) 17x22 ( upper / lower ) 17x25 ( upper / lower ) 18x25 ( upper / lower ) 19x25 ( upper / lower ) 21x25 ( upper / lower ) one pack just include one size, not mixed pack Please tell me the size you need when you buy or pay.If we don't receive your requirements for size within one working day since your paid date, we will random delivery. Thanks for your understanding! 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, you can bid on this item only if 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. Seller name:DEERBELL City,State:SHENZHEN,China Telephone number:0755-36925817 Exchanges are offered for items that are defective or damaged when received, although this is highly unlikely. After exchanges are made and have not resolved the issue, we will refund the cost of the merchandise. Defective items or problems with your order must be reported within 3 days after receiving. Please keep all packaging, documentation, packing list,etc. that came with your order. These will be used to verify claims if there is any problem with you. Restocking fee will be charged for returned items without original package or any quality problem.Please contact us for details before returning your package to avoid misunderstanding. IMPORTANT: Customer's item must be returned to our facility with the ROF (Return Order Form) at the buyers shipping expense. The goods you odered will be posted out in the second working day after the paymet has been made. (We will inform you via email if any delay occured due to holiday events. General shipping time is between 7-12 working days. (After the shipping started, the order will be monitored and the track of the item will be posted on paypal. We accept PayPal only. The address in your paypal details will be used as the actual shipping adress, please make sure the adress is correct. If you are planning on combining your items, please make sure that you wait until ALL auctions have ended before you visit the checkout. All items must be paid within 7 days. Serivce is our 1st priority at Baistra! If you contact us immediately after placing the order, we will make every effort to assist you with your change request. Unfortunately, we can not make changes or cancel an order once it has shipped. We offer the best items at the best prices. We strive to exceed all your expectations and put a smile on your face. Your experience will be a pleasant and effortless one when you buy at Baistra. We stand behind our products and pride ourselves on OUTSTANDING customer service. We guarantee that you will be delighted with your purchase or we will gladly and promptly issue you a refund or make things right!