The single-slot pulley model assembly gear set is an learning tool that provides a hands- to learning about mechanical systems. With 50 pieces included, users can assemble various configurations to see how pulleys and gears interact. This kit is ideal for teachers looking to enhance their science , or for students who want to deeper into the principles of mechanics. Features -Color:Orange -Material:Plastic -Size:0.60X0.60X0.60cm/0.24X0.24X0.24in -Fine craftsmanship: attention to detail in the manufacturing process ensures a durable product for various applications -Accurate gear design: the precise design of the gears ensures smooth and efficient transmission, ideal for learning and mechanical uses -Multifunctional use: ideal for learning accessories, this product is suitable for model assembly, mechanical experiments, and more -Userfriendly installation: easy and quick to assemble, this product is suitable for users of all skill levels, from beginners to experts -learning experimentation: specifically designed to support large scale learning experiments, making it a valuable resource for learning environments Package list: 250 x pulleys