Drum Kits features: 17.3 X 10 x 10cm 3 colors drum bottom microphone bass loudspeaker drum accessories bass hole protection percussion spare parts(Blue) Color: we send based on the color or size of the main image of the product page. Quantity：we send based on quantity on title, if there is no quantity in the title, we send based on description. Colour: Blue Description Features: - Special Design: Tuning port designed for bass drums. - Great Function: Expand your low end frequencies. - Rubber drum ring: The rubber drum ring is tightly fitted to the drum surface, which can be adjusted by adjusting the tightness of the drum skin. - Drum Body: Made of environmentally friendly ABS, durable and not easily deformed. - This product converts the kick drum into a bass reverb speaker, enhances the bass audio advancement, concentrates the air in the drum cavity, and compresses it inside, making the bass part more powerful. The effect is adjustable, just adjust The drum of the drum can be tight. - Hole Protection: Uncover the white protective paper, and stick the adhesive side to the drum skin, and cut it along the inner diameter of the circle to avoid damage to the drum skin and solve unnecessary losses. How to use: - First to attach the opening protection sticker to the bottom drum skin and then draw along the circle of the inner diameter. After the complete circle is drawn, the rubber part of the loudspeaker is stuck, and the drum leather is installed. Name: Drum Subwoofer / Drum Bass Amplifier Material: ABS + Rubber Color: White / Red / Black / Blue Package include 1 x Loudspeaker 1 x Opening Protection Ring