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 effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: ABSandRubber Size: outer diameter 18.5cm or 7.28inch, inner diameter 10.6cm or 4.17inch, height 10.5cm or 4.13inch Using 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. Include: 1 x Bass drum enhancer 1 tection sticker Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.