Affordable and discreet alternative to platforms and risers. Works with any brand subwoofer that accepts screw-in feet. If no threaded inserts are present, double-sided tape or non-abrasive adhesive pads can be used. Fewer complaints from house occupants and neighbors in apartments and townhouses. Cleaner and tighter sounding bass with less floor boom and vibration. Less rattle from objects in the room. Colour:Black Material:Plastic Package Contents: 4 * Subwoofer Isolation Pad 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.