The KickPort T-Ring™ has an outer diameter of 7.25˝ and an inner, port diameter of 5.25˝. In addition to acting as a reinforcement (or a "gasket") that will prevent any vented bass drum head from tearing and splitting around the KickPort, the T-Ring can be used as a template for cutting a 5.25˝ port in any drum head for optimum miking in studio and live situations. Available in black, white or clear.