The Brackitz Pulley Set includes 77 pieces and directions for 8 contraptions - from a moving draw bridge to a 4-foot flying zip line to a bucket escalator. With pulleys, axles, 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. Includes 77 colorful blocks, connecting hubs, pulleys, hooks and buckets. Over 25 FREE standards aligned online lessons.