Roth/MBT Orthodontic Buccal Tube. 50Sets Dental Orthodontic MIM Monoblock Brackets Mini Roth 0. 0 22″ Hooks 3-4-5. Model: Mini Roth 0. 0 22″ with 3-4-5 Hooks. Advanced production techniques on Bracket， Accurate product size, ultra-high precision, and smooth surface greatly reduce oral mucosal irritation.