Product details:

and high quality
It is a 8 Inch bass radiator with high sensitivity & resolution, not a speaker.
Enhances the bass effect of the speaker and makes the bass frequency stronger.
Premium material ensures maximum strength and durability for long lasting usage. Easy to install.
Type: Accessories
Outer Diameter: 198mm/ 7.80in
Colour: black
Material: rubber edge
Package Contents:
2 x Passive Radiator
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.
Manufacturer:China