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Powered by water and imagination. Gears + oil = a mess. Gears + water = hours of bath time fun. The COGS Building Bath Toy from Boon Set stick to the bath walls and spin when water is poured over them. Positioned just right, they work like a fine-tuned (though not well-oiled) machine. Use COGS with PIPES Bath Toys for maximum fun. Gear heads unite! Includes 5 unique gears. Made without BPA and Phthalates.