1. A tuned port designed for bass drum 2. Extend your low-end frequencies 3. 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. Product features:The Bass Drum Enhancer and Drumhead Protector is a must-have accessory for drummers looking to enhance the sound of their bass drum while providing protection. The enhancer is designed to amplify the low end frequencies, providing a fuller, punchier sound. The protector features a durable construction and specially designed open holes to allow for sound projection while safeguarding the drumhead from wear and tear. Easy to install and compatible with most bass drum sizes, this enhancer is the perfect addition to any drum kit. Colour:black Material:ABS+rubber Size:19x11x11cm Package Contents: 1 x Bass drum enhancer 1 x Protection sticker Only the above package content, other products are not included. Note: Light reflection 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.