Its interesting to see how those little wires and tiny insulation disks build up the nixie tube. I opened a few, which were broken to examen what is inside. I would love to use them for necklace or any kind of accessories just as a cool thing. Unfortunately it contains mercury which definitely not good for my, your or anybody’s health. So do not open any tube and do not play with the parts inside! Do not lick them or touch them and lick your fingers. Its dangerous, unhealthy, deadly. Keep away from everything and everybody and wash your hand very well if you get to do.