Thats branded cassettes. These are metal type IV cassettes and are audiophile quality with very high quality shells.

"Thats" is the name brand that Taiyo Yuden used to market their own cassettes.Taiyo Yuden is still in business and makes magnetic media for industrial products. They no longer make recording tape.

We used these tapes as customer copy tapes for our classical recording business for many years. We tried using many other brands and the Thats tapes were the most reliable ones we could get. We only had one failure of a Thats brand tape out of many hundreds of  tapes recorded. C-60 cassette tapes are made with thicker tape backing stock and are much more reliable than C-90 and longer tapes. We used Nakamichi MR-1 tape decks.

Be sure your recorder can use these tapes. The cassette decks sold today can not properly record these tapes due to the tape heads not being capable of supplying the magnetic flux to record at high levels.