Stylish Vacuum Tube Necklace from Avant Garde Design. The authentic vacuum tubes come strung on a 20 inch silver colored necklace with a lobster clasp. (If you would like a shorter or longer necklace, please provide a note along with your order)
The vacuum tube is about 2 inches long and comes in a free earth colored gift box.
More about Vacuum Tubes:
"Vacuum Tubes were critical to the development of electronic technology, which drove the expansion and commercialization of radio broadcasting, television, radar, sound reinforcement, sound recording and reproduction, large telephone networks, analog and digital computers, and industrial process control."