1.100% Band new and high quality 2. A tuned port designed for drum 3. Extend your low-end frequencies 4. Add more punch to your sound 5. Make the part more powerful,and the effect is adjustable;You only need to adjust the tightness of the drum surface Enhancer instantly improves the sound of any drum.High Wear-resistant and excellent durability Using :First put the protective sticker on the kick 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 complete Colour:Red Material:ABS+Rubber Size: Outer diameter: 18.5cm inner diameter: 10.6cm/4.17inch height: 10.5cm/4.13inch Weight:190g/6.7ozPackage Contents: 1 x drum enhancer 1 x Protection sticker 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.