Pulp-Mica Cone Body Carbon Fiber Dust Cap Cast Aluminum Frame Triple Stacked High-Power Strontium Ferrite Magnets (174oz x 3) Dual Progressive Spiders with Integrated Tinsel Leads High-Amplitude Multi-Roll (H.A.M.R.) Surround Included Mesh Grille with Aluminum Trim Ring Mounting Depth: 7-7/16" X-Max: 20mm · Voice Coil: 65mm Frequency Response: 26Hz-200Hz Sensitivity: 82.2dB Nominal Impedance: 4Ω+4Ω Power Handling: 800W RMS / 2400W Peak