Polk Audio DB6501 6.5-Inch 2-Way Component System (Pair, Silver) Adaptor Rings make it easy to fit the db6501 in 6-1/2 inch and 6-3/4 inch applications Two-way Butterworth outboard crossover with vented housing, electronic tweeter protection circuit Woofers feature polymer/mica composite cone with butyl rubber surround, Kapton voice coil former. 6.5-inch component system with pair each of woofers, tweeters, crossovers 25mm liquid-cooled silk/polymer composite dome tweeters with neodymium magnet for clear, detailed highs Special Shipping Information: This item cannot be returned to Amazon.com. For additional information concerning this policy, please visit our Product Specific Returns Policy Page 6.5-inch component system with pair each of woofers, tweeters, crossovers Woofers feature polymer/mica composite cone with butyl rubber surround, Kapton voice coil former 25mm liquid-cooled silk/polymer composite dome tweeters with neodymium magnet for clear, detailed highs Two-way Butterworth outboard crossover with vented housing, electronic tweeter protection circuit Adaptor Rings make it easy to fit the db6501 in 6-1/2 inch and 6-3/4 inch applications