No plugs nor contact electrodes, yet it still lights up when held in a high-voltage field! Your students will be amazed. This neon wand is filled with neon at reduced pressure and will glow a reddish-orange color when you hold it in or pass it through a high-voltage field. This wand is easier to handle than a large fluorescent lightbulb. It measures 24 cm long and 1 cm in diameter and comes with background information on neon.