.75" Spacer to Decrease Depth of Subwoofer</br>MDF Construction</br>Premium Carpeted Finish with Rounded Edges</br>12" speaker woofer spacer</br>Product is a Single Spacer</br></br>Product Description</br></br>Atrend's S12 Subwoofer Spacer ring adds .75 inches to most 12" subboxes to decrease the mounting depth of your subwoofer. Our S12s are versatile and easy to use in different applications. Bbox enclosures and accessories are built by the world??s leading manufacturer of speaker enclosures. A globally recognized brand that specializes in ensuring sound quality is delivered in each and every hand-made enclosure. Only trust Atrend for your subwoofer enclosure and car audio needs.</br><br/>http://www.amazon.com/gp/product/B0013NWD12