Mega V Contact Matrix System - Ring Refill 2/Pk. Designed for consistently tight, reliable contacts. Helps ease and simplify wedge placement with an open 'V' design. Converging tines prevent pop-offs. Large hoop diameter provides easy access and inclined angle allows for stacking rings. Autoclavable alloy construction. *Please note Mega V rings are not compatible with other manufacturers' matrix systems, only the Danville Materials Mega V system. Trial kit 94270 suggested for new users. Box of 2 rings