Project Blueprint Euler's Disk, Desk Toy

A hypnotic display of light and sound that spins science into art. The 3" diameter chrome-plated steel disk will spin faster and louder the longer it rotates. Just give it a spin and gravity does the rest. Includes Disk, 9" concave mirror base and 9 pieces of holographic, magnetized foil. 6 disks included per pack. • Age Grade: 8+ • Product Dimensions/Weight: 9.4 L x 9.9 W x 1.7 H / 2.0 lb • Inner Pack Dimensions/Weight: 10.60 L x 10.10 W x 10.70 H / 13.40 lb • Made In: Taiwan • Batteries not required