We can't really be sure what is on these and of course you can record over them. But we have a substantial collection of reel to reel tapes along with tape player/recorders from the 1960's and 1970's.

Oh how far technology has come, but in the movies we still need vintage props like these reel to reel tapes. Because we still show people in the 1960's and 70's and want to be accurate.

Not sure anyone could generate an old reel to reel tape recorder in Blender and render it on a green screen. But with Mr Dog Poop Studios, you wont have to, you can in fact have a real one on set.