Features:  1. Made of ABS with environmental protection, durable, not easy to deform, rubber drum, relaxation degree.  2. This product converts the bass drum into a bass reverberatory box to enhance the bass audio propulsion.  3. Concentrate the air in the tympanic cavity and compress it so that the bass part can be released more forcefully.  4. And the effect is adjustable, just need to adjust the tightness of the drum skin.  5. Enhance the sound of the kick drum, installed on the bass drum resonance skin.  6. Increase the low frequency, equivalent to the audio subwoofer.  7. Plastic bass drum port hole kit bass enhancer percussion instrument parts.     Specifications:  Color: White, red, black;  Material: ABS, rubber;  Net weight: 260g;  Model Number: Bass Drum Enhancer;  Size: As shown in the figure;  Usage: stick the hole protection on the bottom drum skin first, draw along the ring of the inner diameter, draw a complete ring, and then install the rubber part of the loudspeaker.     Package Included:  1x Bass Drum Enhancer.