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By certification 
Product Name: 3D Orthodontic Self Ligating Brackets
Model No.:H3150/H3151
System:Roth/MBT
Slot:0.022
Hook: No hook/3WH/345WH
Material: Stainless steel 17-4
Place of origin: Hangzhou, China
HS: 9021100000
Ordered by set: 5-5
Free: 6-7
Description:
1. Manufactured by 17-4 Stainless Steel MIM (Metal Injection Molding)
2. Vertical marked for easy positioning of the brackets
3. 80 mesh base to make smooth finishing of the bracket and excellent adhesion force on base
4. Ultra-thin body makes patients more comfortable
5. Rounded edges
6. Passive design, The passive design of the Clip provides excellent sliding mechanics.
http://www.headwayortho.net/
