MB Quart Formula FKA113 5.25" 2-Way Coaxial Speaker System 5.25" 2-Way Coaxial Speaker System with 35-80 Watt Power Rating and 58Hz-32kHz Frequency (Sold in Pairs) Two-piece 0.75 (19mm) tweeter with titanium-coated dome Rugged stamped metal chassis with a polypropylene cone for structural rigidity Spider with woven tinsel leads for high power Formula crossover with small chassis; Surface and flush mount tweeter enclosures