CUSTOM MADE 3" Subwoofer Voice Coil. - 3.018" I.D. on black anodized aluminum former. Compatible with Mmats Juggernaut Subwoofer and many more subs that require the specs above. Voice Coil Specs ------ Coil AVC302D2 Ohms Dual 2 Layers 4 Former Material Aluminum Windings Flat aluminum Former Height 3.75" - 95mm Lead Length 2.25" - 57mm Inner Diameter 3.018" - 77mm Outer Diameter 3.18" - 81mm RMS Power Handling - 1800W