General Features: Pure Aluminum Flame Style Grille Fits most 15" round subwoofers Polished Chrome appearance for sleek, custom look High clearance for up to 2.75" of linear excursion Resonate proof (4mm of thickness prevents vibration) Fits all 15" Audiobahn Aluminum die-cast and steel basket woofers Ships in wooden gift box Solid cast aluminum doesn't flex or vibrate with low bass-notes