1) stainless steel metal.
2) 0.002mm precise error , compare 0.02mm with milling technology made.
3) Low friction , low Nickel Titanium (less than 4% ).
4) The best of all, this new series brackets are made with One Piece-Construction, but 80 mesh pad is integrated, just like 3M Victory series. Bonding test strength is 12-15 KG , as strong as any brackets in the world.
5) 100% preventing a loose pad or even a loose bracket from the teeth.
6) Fine polishing , nice looking presentation.)
Slot size 0.022(0.56*0.76mm)/0.018(0.46*0.76mm).
No hook or hooks on 3/3,4,5.