The product is a set of two 8-track tapes of Chicago's album "Chicago IX - Chicago's Greatest Hits" released in 1975 by Columbia Records and Chicago. These tapes feature the popular rock band Chicago's greatest hits in English, with a pop rock style and stereo audio. The 8-track cartridges are from the 1970s era and include features such as Dolby System for enhanced sound quality. This nostalgic collection is a great addition for fans of classic rock music or collectors of vintage audio formats. These are untested.