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.