Separator rings that produce optimal tooth separation for excellent, tight contacts. Long lasting and predictable due to advanced materials and design. Nitinol drawn-wire nickel titanium is aligned at the molecular level for superior performance, yet requires less effort to open. PEEK ultra-durable reinforcement on the back of the ring allows Strata-G to retain a higher percentage of initial strength for much longer than non-reinforced rings. Enhanced marginal ridge guides and matrix band support. StrataBond silicone for unsurpassed flash control. Ultra-Halt retention extensions provide tenacious grip and are gentle to the papilla. Versatile and user-friendly system. Excellent contact and contour.