Any info on Teac reel to reel cassettes?

Back in the early 80s, Teac came out with some reel to reel cassettes that was kind of unusual. The kit came with one aluminum cassette shell that took interchangable metal reels that was loaded with about 60 minutes worth of high-bias tape. The kit came with 5 of these metal reels. It was cool to watch when played in a tape deck but it was a pain to thread these tapes. I think that was why this product never gained acceptance. Does anyone have any information on this product and where I might be able to get some? Thank you for any replies.