Cpolebev Bass Drum Enhancer Port Insert Enhancement Hole Protector Amplifier Kick Booster with Protection Sticker B

4. The reverberation speaker can enhance the propulsion of audio, concentrate and compress the air in the drum cavity to the inside, making the part more powerful. The effect is adjustable. Just adjust the drum tightness. 1. Made of environmentally friendly ABS material, which is and not easy to deform. 3. The drum ring fits closely with the drum , which can be adjusted by adjusting the tightness of the drum skin. 2. drum design tuning port to expand your low-end frequency. 5. The inner diameter of the drum shall be cut along the circle to avoid unnecessary damage.