1, Packed in 20pcs/set 2, Roth/ Edgewise/ MBT 3, With Hook or No Hook 4, Good Quality... ... can be classfied as following: Ceramic Edgewise Bracket 0.022"/0.018"No Hook Ceramic Edgewise Bracket 0.022"/0.018"3 ... #W/Hook Ceramic Edgewise Bracket 0.022"/0.018"3,4,5#W/Hook ...