All “Rebel” upgrade features include Dual 4 / 2” CCAW voice coils on an aluminum former with reinforced neck joints, 5 way binding posts with push or banana nickel plated terminals, twin poly-cotton dual roll spiders with woven round tinsel leads, dual wave roll surrounds and FEMM engineered motor plates with a white zinc finish. All “Rebel” Series woofers have a poly glass fiber caped UV treated paper cone, High Energy Double Stacked 120oz. Strontium Magnet Structure. Owning a pair of “Rebel” Series subwoofers proves to everyone that you won’t settle for the status quo! So get in, buckle up and turn it up with Massive Audio “Rebel Series” Deep Cycle Subwoofers.