Pre-recorded open reel tapes. These tapes were used over half a century ago. I don't know what is recorded on them because I don't have a device to play them. I also don't know if they can be used normally. Please understand this. 7-inch (175mm diameter) x 5 reels, 5-inch (125mm diameter) x 1 reel, 3-inch (85mm) x 10 reels, 2-inch (75mm) x 1 reel 7-inch (175mm) empty reel x 1 Total: 17 reels + 1 empty reel