This is the BIG ONE! It gives you Structures, Pulleys & Cranks, Wheels & Axles, and Gears, Sprockets, & Chains all in one. It’s ideal for library makerspaces and creative spaces in classrooms. It’s big enough to share across classrooms and it’s a BIG launching pad for special challenges and school-wide design/build projects and contests. Details:Large durable piecesIncludes all Brackitz Structures, Wheels & Axles, Gears, Sprockets & Chains and Pulleys in CranksIncludes 100 free downloadable lesson plans and activities for PreK through 6Convenient containers for hassle-free cleanup and storageEasy to clean with soap and waterFor ages 4 and up