Features:1. The bass drum enhancer is made of high-quality ABS and rubber materials, wear-resistant and durable. 2. A tuned port designed for bass drum. Make the bass part more powerful, and the effect is adjustable.3. Extend your low-end frequencies. Add more punch to your sound.4. Make the bass part more powerful,and the effect is adjustable;You only need to adjust the tightness of the drum surface.5. The revolutionary Enhancer instantly improves the sound of any bass drum. Notice:1.Actual color may be slightly different from the image due to different monitor and light effect2.Please allow 1-3cm deviation due to manual measurement Description:Material: ABSRubberSize: outer diameter 18.5cm/7.28inch, inner diameter 10.6cm/4.17inch, height 10.5cm/4.13inchUsing Method: 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. Package List:1 x Bass drum enhancer1 x Protection sticker