Description: Bass Drum/Kick Drum/Drum Set Port Hole Kit Bass Enhancer. Made of environmentally-friendly ABS plastic, it is durable, not easy to deform. Rubber drum ring, can be a degree of relaxation. This product converts the kick drum into a bass echo speaker, strengthens the bass audio propulsion, concentrates the air in the drum cavity, and compresses it inside, which makes the bass part more powerful, and the effect is adjustable, only need to adjust the tightness of the bottom drum skin. Comes with a drum enhancer ring Specification: Material: ABS Plastic Size: appropx. 170x106x100mm/ 6.69x4.17x3.94inch Package Includes: 2 x Drum Enhancer 2 x Drum Enhancer Ring Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.