VIBE Blackair Series 12-Inch 400W RMS Dual 2 Ohm Subwoofer BA12 The front gasket is made from high quality machined aluminum for a high-end aesthetic to complement the bold yellow fiberglass cone design. The BlackAir's striking yellow cone was designed using FEA (Finite Element Analysis) for optimum rigidity to weight ratio, the hybrid woofer cone is made from an absorbing polypropelyne and fiberglass. The result is increased depth and clarity of bass. The BlackAir's dual progressive poly-glass spiders provide control and stability of the woofer cone whilst minimizing weight. The BlackAir features a specially developed foam rubber multi-roll surround allowing much better linearity throughout the subwoofers excursion range. The angular torsion basket provides rigidity and support for the motor and moving parts of the subwoofer.