BigRoof Plasma Ball, Generic USB Powered Plasma Ball SAFETY AND HEALTHY USE: Plasma ball is high strength glass sphere filled with noble gases to power supply. The power and gas in the sphere produced the magnetic light. Produce the negative ion, so theres no danger from human touch, no radiation damage. Some positive ions produced by various electric appliances in the closed space. This makes the human body very easy to get dizzy. So, the plasma ball can help this.