Yamahas SW118IV is a Club Series 18 in. cast frame subwoofer. Caster wheels installed for pushing them around. This listing is for one speaker, but I have more if you need them. Retails for $720+tax+shipping. These rugged, durable performers have a proven track record. Black carpet covering helps them stand up to abuse without showing ugly road rash. All new components, with professional features, make the Club Series IV perform the way you need them to, time after time, at prices you can afford.For more than ten years, the Yamaha Club Series of speakers have been making performances everywhere easily heard by the audience and performers as well. Throughout the years, weve improved the quality and durability of these speaker systems. The new Mark IV Series may be Yamahas finest loudspeakers yet.Yamaha Club Series speakers have all the features and components professionals demand, at an affordable price!All Club Series speakers are manufactured in the United States. The Yamaha factory in Thomaston, Georgia, uses the latest computer controlled woodworking machines. This assures the quality you have come to expect from us.Woofer: 18 in. cast basketTweeter: n/aFrequency Response (-10dB): 30Hz-2kHzPower Rating program/peak: 500/1000Imp (ohm): 8SPL (1W, 1m): 96dBDimensions (W x H x D): 21 x 26 x 31 in., approximatelyWeight: 71 lbs.