Roth 0.022″, UL 1, UR 1,LL 1,LR 1. 2 、 surface texturing process used in the ring, improve the bond strength by 30%. Convertible U/3 L/2. 35#-40+#With Bands. 1 、 Form a ring with computer simulation design, teeth close fit, moderate hardness, laser marking, permanent marking clear;.