Brackitz award winning, open-ended building toys are unique in their ability to connect anywhere, at any angle. 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. Recommended for ages 7 and up.