Ohms: Single 4ohms Sensitivity: 87.5dB Watts Rms/Max: 250W/500W Magnet Oz: Y30 – 33 Oz. Magnet Size: 120 x 50 x 20mm Coil Size: 38MM COIL, 4 LAYERS, COPPER WIRE Gasket: RUBBER WITH LOGO Dustcap: Polypropileno Spider: 1 Layer Basket: Steel Material Cone: NON PRESSED PAPER