BUILD & LEARN || Easy to build and fun to use, this kit allows you to literally play with the physics of catapults! Create your own functional 13cm x 20cm catapult with this easy to assemble kit. Great for home-school or STEM projects. Recommended for ages 6+. STEM LEARNING || Introduces and demonstrates real world STEM concepts. Allows learners of all ages to explore and visualize physics concepts of catapult.