MB Quart Formula FKA157 5 x 7" 2-Way Coaxial Speaker System 5 x 7" 2-Way Coaxial Speaker System with 50-100 Watt Power Rating and 40Hz-32kHz Frequency 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