Blue Plasma Ball 6 Inch | See the power of lightning at your fingertips! The 6" Blue Plasma Ball is a fun novelty item and reacts to your touch or even the music you play! At 6 inches round and 12 inches tall, this 6" Blue Plasma Ball makes a great addition to tables or desks in any environment. You can bring it out at parties or as an all year decoration. Watch science dance before your eyes! The 6" Blue Plasma Ball includes an AC Adapter so you'll never run out of power.