An injection-molded, metallic-finish polypropylene cone with an embossed metallic JL Audio logo provides a classy new look, while a removable (and customizable) mounting flange trim ring receives grille-mesh inserts directly, without the need for additional grille hardware. (Grille mesh inserts are sold separately.)
these woofers are extremely smooth in their frequency response with no annoying sweetspots in the recommended ported box. and the 10" in a tiny 0.3 cuft box sounds very, very acceptable also. 150W is plenty for these. 300+ watts makes them happy. 
cliffnotes: cone material means very little in a sub's overall performance.
ever seen the "German" aluminum-coned subs? those things are crap!