The product description: Advanced production techniques on Bracket ，Accurate product size, ultra-high precision, and smooth surface greatly reduce oral mucosal irritation. makes it easier for doctors to operate, and the minibracket is comfortable for patients to wear. The clear central axis, precise torque, angulations and slot size. Removable color coded ID dot, for easy brackets selction. Adopting advanced MIM production technology, high-quality medical stainless steel materials, fine processing, and precision molds to ensure product consistency. The bracket and base together, one Monoblock, Solid stainless steel single-unit construction eliminate sweld spots and is much stronger than welded attachments. Integral pylon base increase bond strength. Features: Model: Mini Roth/MBT 0.022"/0.018" with 3-4-5 Hooks Material: Metal Specification 20 Set per Box, 20 Pieces per Set, (In total 400pcs) Specification 50 Set per Box, 20 Pieces per Set, (In total 1000pcs) 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:Dentistryshop City,State:SHENZHEN,China Telephone number:0755-23998164