Powered By Water. And Imagination. Gears + Oil = A Mess. Gears + Water = Hours Of Bath Time Fun. Cogs Suction 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! Spinning Gears Suction To Bath Walls Linked Gears Create A Water-Powered Chain Can Be Used With Boon Pipes For Even More Fun! Includes 5 Unique Gears Made With Bpa Or Pvc Free Materials For The Baby'S Safety