@Nine hey, they're chrome tapes, so they're not bottom-of-the-line ones! (there were four different formulations; type 1 or ferric was the cheapest, then type 2 or chrome was better quality, type 3 or ferro-chrome was not really much better than type 2 and was pretty short-lived, and then type 4 or metal was most expensive and highest quality)
@BatElite @Felthry All cassette tapes have (presumably, please correct if I'm wrong) ferrous particles on the tape because that's how it stores data, with magnetic arrangements of the electrons. The default type 1 is just an iron compoound of-whoops okay nevermind Felthry's doin' the explaining way better than I could. ^^
