Roland Electronic Drum Accessory (RT-30H) Advanced head-based trigger device for playing electronic sources from acoustic drums Installs on nearly any metal drum hoop, including the latest inward-curved hoop styles Newly developed self-guided mount makes installation quick and easy Durable fiberglass-reinforced ABS body and secure mounting mechanism for dependable operation Compatible with Rolands TM-2 Trigger Module, TD-series V-Drums sound modules, and SPD-series percussion pads