This is my first prototype for a woofer that would retail from a shop for 6070 each. Rated for 300watts RMS and a full 1416mm linear excursion ONE WAY. Incredibly high for a driver in this price range. It features a poly cone, rubber surround, rugged spider, 1. 5 copper coil on aluminum former, and double stacked motor (to allow for it s high linear excursion).