Great Function: Expand your low end frequencies.Hign Quality: The bass drum enhancer made of environmentally friendly ABS, the gold nine is durable and not easily deformed.How to Use: 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.Serve Guarantee: Please contact us if any questions before ordering.Special Design: Tuning port designed for bass drums.Name: Drum Bottom Drum Woofercolour:whiteMaterial:ABS+ rubbersize:17*10*10.6cmPackage Contents:1 * Bass Drum Enhancer(with Drum ring)Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.