The Hoberman Mini Sphere NEON expanding ball is a fun and educational toy that can grow from 6 inches to 11 inches in diameter. With a colorful multicolor design and a theme centered around yoga, this toy is suitable for various age levels, from young children to adults. The ball also doubles as a tool for learning about science concepts, making it a versatile and engaging toy for playtime or educational purposes.

Seems to glow pretty well under my black light flashlight