These are a set of very high quality speakers made by PSB. They are brand new and have never been used. They have no blemishes whatsoever. These speakers cannot be found in big box stores like Best Buy but are sold through high-end, exclusive audio centers. Although these speakers can be used in terms of a stereo system, they are perfect as part of a home theater surround system (rear speakers). They can also be easily removed from their stands and used as bookshelf speakers. Instead of me trying to list all of the technical specifications here, I will simply provide a few links that detail these incredible speakers: