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Drum Bottom Microphone Loudspeaker Voice Sound Amplifier Drum Accessories Bass Hole Protection Percussion Spare Parts Feature: 1 Made of environmentally friendly ABS material, which is sturdy and never smooth to deform 2 Bass drum design tuning port to expand your low-end frequency 3 The drum ring suits closely with the drum surface, that are adjusted via adjusting the tightness of the drum pores and skin 4 The bass reverberation speaker can boost the propulsion of bass audio, focus and compress the air in the drum cavity to the inside, making the bass part more powerful The impact is adjustable Just adjust the drum tightness 5 The inside diameter of the drum might be cut alongside the circle to avoid pointless harm Specification: Material: ABS Color: Black,White Loudspeaker size: inside hole diameter 10, outer gap diameter 18cm and top 10cm Ring adhesive size: internal diameter 13, outer diameter 18 How to use: First to attach the hole protection sticker to the bottom drum pores and skin and then draw along the circle of the inner diameter After the whole circle is drawn, the rubber a part of the loudspeaker is stuck, and the drum leather-based is installed Note: Due to the several video display and light-weight effect, the particular coloration of the article might be slightly different from the colour showed at the images Thank you! Please enable 1-2cm measuring deviation because of handbook measurement 1 x Loudspeaker 1 x Ring Sticker