The Remo Dynamo Ring has an outer diameter of 7.4 Inch (187mm) and an inner, port diameter of 5.35 Inches (136mm). In addition to serving to reinforce bass drum head from tearing and splitting around the Dynamo, the Dynamo can be used as a template for cutting a 5.35 Inch port in any drum head for optimum micing in studio and live situations.
The Remo Dynamo Ring has an outer diameter of 7.4 Inch (187mm) and an inner, port diameter of 5.35 Inches (136mm). In addition to serving to reinforce bass drum head from tearing and splitting around the Dynamo, the Dynamo can be used as a template for cutting a 5.35 Inch port in any drum head for optimum micing in studio and live situations.