Adorox Liquid Bubble Drop Motion Wheel Zig Zag Desk Toy (Single Color Z Shape (Wheel Swirls)) Contains 1 per package, colors given at random(colors may vary see description for more details) Measures Approx: 5.5" tall x 3.5" wide ; 1" thick Note: Keep out of direct sunlight. Colored oil droplets rotate two Wheels as they zig zag down the ramps Mesmerizing and Great fun for everyone! Stimulates curiosity