T-RING, BLACK serving to reinforce bass drum head from tearing and splitting around the KickPort the T-Ring can be used as a template for cutting a 5.25-inch port in any drum head for optimum miking in studio and live situations. The KickPort T-Ring has an outer diameter of 7.25-inches and an inner, port diameter of 5.25-inches. Join the 100,000 other drummers worldwide who are experiencing the improved feel, power and tonal qualities more focused natural overall sound