1. Monoblock brackets and buccal tubes with ball hooks, one-piece construction. 2. Inverted concave structure on base to enhance bonding strength. 3. Chamfered mesial entrance for guiding arch wires easily. 4. Lower profile and compact shape, patients feel more comfortable. 5. VST tubes can be pre-welded on bands directly. 6. Tooth mark on base and color mark on tube for ovious identification.
