Sylvania Blue Dot Flashbulbs. Package shows age; however, id doesn't look like anyone ever tampered with lightbulbs. I am sure that most of the lightbulbs will work (maybe all). However, given the age of the product I am not making any guarantees. FOR USE WITH ALL BLACK AND WHITE FILMS INDOORS AND OUTDOORS. This thing would look good just sitting on the mantle or next to some old vintage camera.