Matrix Band Retainer Secure locking mechanism and instant release enable the Classico Tofflemire™ Type retainers to tighten and release with precise, effortless action. The clean, smooth surface is free of burrs and sharp edges that can cause gingival trauma. Easy insertion and adjustment; handles any width band. Permits accurate trimming of wider band for special anatomical needs. Contra-Angle model can be used buccally and lingually.