Model Number:CEL 12 12-inch Car Subwoofer with 1500Watts RMS, Suitable for SPL Challenge subwwooferKey Specifications/Special Features:Non-pressed paper and woven cone Tall roll rubber surround 4-inch CCAW voice coil with black aluminum former 3 x 100oz magnet 2 layers nomex spider Dual 2 ohms impedance 1500watts RMS Size: 10 and 15 inches are also available subwoofer(CEL12)