This product consists of six glass-sealed inert gases: helium, neon, argon, krypton, xenon and nitrogen.
If you only use it for the demonstration of Tesla coil, it can be used for a long time without damage.
The excitation device needs to move back and forth. Do not stay at the same point for more than 5 seconds to prevent the electric spark from breaking through the glass. At the same time, the electric spark should not stay at the tip.