The Brackitz pulley set includes 77 pieces. Build 8 contraptions - from a moving drawbridge to a 4-foot flying zip Line to a bucket escalator. With pulleys, axes, hubs, hook, crank, and string, engineers of all ages will have fun building and cranking contraptions that haul, lift, slide and move up/down. No hard hat required. With a strong emphasis on STEM learning skills, this educational toy helps children build a solid foundation in science, technology, engineering, and mathematics.

• Used in classrooms to demonstrate engineering concepts like resistance, force, motion and mechanical advantage using simple machines
• Well-made pieces go together easily and stay together creating unique 3D structures from simple to more advanced models
• We independently test your construction toys to meet Consumer Product Safety Commission standards and ensure they're completely free of dangerous chemicals like lead, phthalates, and BPA
• Easy to clean with soap and water
• Grade 2-6/ 7+ years
• Build replicas of real-world simple machines like the Archimedes crane, a moving drawbridge, a 4-foot flying zip line and more