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Allows students to explore the concepts of levers and pulleys, Accommodates 1-2 students Easy-to-follow, step-by-step building instructions included 139 parts to build unique, fully-functioning replicas of real-world models Age 8+, 139 parts to build unique, fully-functioning replicas of real-world models: a balance, a wheelbarrow, and a sailboat. Includes 3 after-build experiments that teach your child about STEM concepts like lever classes, pulley systems and more.