This is a set of vacuum tubes. There are 2 new tubes in their original boxes and 16 used tubes. I received these as working items, but I have not been able to confirm their functionality. Please understand that these are being sold as junk items. Details are as follows: To prevent damage, I will protect them with air caps and pack them securely to prevent movement inside the box during shipping. - Brands: HITACHI, NEC, Mitsubishi, Toshiba, Mazda, Sharp, and others - Models: 5U8, 6U8, 6U8A - Quantity: 29 total - Breakdown: 5U8 used x 19, 6U8 used x 7, 6U8 new x 1 6U8A used x 1, 6U8A new x 1 That is all. This is a bulk listing of the same model and related model numbers. I hope you will consider purchasing them. Thank you for reading to the end.