1.100% Band new and high quality2. A tuned port designed for bass drum3. Extend your low-end frequencies4. Add more punch to your sound5. Make the bass part more powerful,and the effect is adjustable;You only need to adjust the tightness of the drum surfaceEnhancer instantly improves the sound of any bass drum.High Wear-resistant and durabilityUsing :First put the protective sticker on the drum skin,and cut along the inner diameter circle to make a complete circle.The rubber part of the loudspeaker is stuck on the drum skin and the installation is completeColour:blackMaterial:ABS+RubberSize:Outer diameter: 18.5cminner diameter: 10.6cm/4.17 inchheight: 10.5cm/4.13 inchWeight:190g/6.7ozPackage Contents:1 x Bass drum enhancer1 x Protection stickerOnly 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.