Mega Rings and matrices make perfect, tight contacts even easier. They apply the greatest force for the tightest contacts. The design allows easy “stacking,” and converging tines prevent “pop-offs” while offering the widest tines to span the widest preps. They greatly resist distortion, both in their new, unique alloy, and in their raised-back, reengineered design. Contact Matrix matrices resist crumpling since they are made of ultrathin, springy stainless steel. For more information, call (800) 827-7940.