These were bought from Tapeline (a brilliant UK online tape store that no longer exjsts) in 2008 for a record label project that sadly didn’t get off the ground. They’ve been in a box ever since! I am 99% sure they are 60 minutes in length owed to the small signifier where the tape magnetic tape can be seen. There are 100 in total and I also have blank labels to accompany them. They come with cases. I think they’re very cool with the yellow sprocket / spindle gear. Get in touch if you have any questions.
eBay