The Brackitz Gears, Sprockets and Chains module is an add-on educational construction kit to the Brackitz Structures module (sold separately). Students learn to design and build with gears gaining a hands-on understanding of the principles of motion and work. This kit is designed specifically for the classroom supporting up 4-6 students at one time and includes 25+ free online lessons and activities for grades PreK-6. A reusable storage bin keeps all the pieces together and organized. Details: Large, durable pieces 503 pieces 25 free downloadable lesson plans Easy set-up instructions Includes reusable storage bin Meets Consumer Product Safety Commission standards For use with Brackitz Structures Set (sold separately) Easy to clean with soap and water For ages 4 and up