Superstructs Wacky Machines A big 59 page Illustrated construction guide is included that shows you how to make models that use gears. Makes Crazy Clock, Ferris Wheel, Driller Car, Thumping Whatcha-ma-call-it, Lawn Mower, 3-Wheeled Car, Crane with Gears Made of durable ABS, PE Plastic and EVA Foam and are dishwasher safe for easy cleaning More Difficult Difficulty Rating