(2) Qpower QBOMB Single 12 Subwoofer Boxes Your 12" Woofers will hit really hard in the enclosures (Pair) Features a Black Bed "Rhino" Liner Spray Finish Mounting Depth: 4.75" Air Space: 0.9 Cubic Feet per Box Dimensions: 20" (W) x 15" (H) x 5"- 7.25" (TD-BD)