2.5" Dual 4-Ohm 4-Layer Voice Coil?? Royal Blue Finish with Diamond Cut Accents?? Die Cast Aluminum Voice Coil Heatsink</br>Non-Pressed Pulp Cone?? Polyether Foam Surround</br>Nickel Plated 8ga Compression Wire Terminals?? Dual Poly-Cotton Spiders?? Die-Cast Aluminum Frame?? Vented Pole Piece</br></br>Product Description</br></br>New MOFO woofers have a composite sandwich poly/paper cone that includes a dustcap with aluminum stiffeners. This eliminates cone flex and eliminates cone flex during low bass and high excursion. This new dustcap also cools the high efficiency voice coil! Cast aluminum basket and increased bottom octave output?? this woofer is louder in all the right places!</br>