Bottom Drum Microphone Speaker Voice Sound Amplifier Percussion Accessories Bass Hole Protection Drum Spare PartsFeature:1. Made of environmentally friendly ABS material, which is durable and not easy to deform.2. Bass drum design tuning port to extend low-end frequency.3. The drum ring fits tightly on the drum surface, which can be adjusted by adjusting the tightness of the drum skin.4. The bass reverb speaker can improve the bass sound drive, concentrate and compress the air in the drum cavity to the center, making the bass part stronger. The effect is adjustable. Simply adjust the tightness of the drum.5. The inner diameter of the drum should be cut along the wheel to avoid unnecessary damage. Specification:Material: ABSColor: Black, White Speaker Size: 10.6cm diameter inner hole, 18cm outer hole diameter and 10cm height Ring glue size: 13.5cm inner diameter, 18.5cm outer diameter Usage:First, attach the hole protective sticker to the bottom skin of the drum, and then draw along the inner diameter circle. When the full circle is drawn, the rubber part of the speaker is locked and the drum skin is installed. Note:Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Please allow 1-2cm measurement deviation due to manual measurement.