Cassette Maxi Singles
Occasionally, a cassette single would also be released in two cassette formats simultaneously: a traditional Cassette single with two tracks and a Cassette maxi-single with four or more tracks, generally remixes. This practice was experimented with in the late 1980s but was uncommon even then.
Example: Debbie Gibson – Out Of The Blue (cassette maxi-single) Released by Atlantic in 1987 in the USA. Includes 4 mixes: 1. Club Mix, 2. Bonus Beats, 3. Drumapella, 4. Dub Version. This was packaged in a 12" x 3" cassette maxi single longbox (with a regular cardboard slipcase/cassette inside), although most later maxi singles were just issued in regular style cassette cases.
Read more about this topic: Maxi Single