Easy-to-use system that ensures consistently superior contacts on posterior composite restorations. Versatile for a wide range of applications. This operator-friendly retaining system ensures an anatomically accurate contact at a tooth's natural height of contour. The gold rings have been preset with a tension in the resting position; their thickness provides better retention in the mouth, and they have a better ability to both stack rings over one another for multiple-tooth restorations and adapt alongside a wedge better than rectangular rings.