This is a package deal that includes (2) Skar Audio SDR-10 D4 subwoofers. The Skar Audio SDR series was engineered to dish out reliable, hard hitting, and low spectrum sound. Featuring a high flux ferrite motor, This woofer will provide extreme power handling for extended periods of time. The SDR series will quickly become a customer favorite, as it's perfect for people just entering the world of car audio all the way up to seasoned pros. The SDR series Features a 2. 5” high temperature 4-layer high temperature copper voice coil that is attached to our Skar Audio signature red spider. The surround on the SDR series is a high roll foam surround which allows the woofer to produce riveting low end bass response. The SDR series has a max power rating of 1, 200 watts and a RMS Power rating of 600 watts. Sold as a Package - Includes 2 SDR-10 D4 10-Inch Dual 4 Ohm Subwoofers Peak Power: 1200 Watts RMS Power: 600 Watts 2.5" High Temperature Copper Voice Coil Competition Grade Pressed Paper Cone - Frequency Response: 30 - 300 Hz