ARRMA Pinion Gear, 34T Mod1 Safe-D8, is not just a functional component—it's a gateway to understanding mechanics for our curious young minds! Perfect for budding engineers, this pinion gear teaches principles of gear ratios and power transfer while engaging kids in hands-on projects. With its precision design to prevent slippage, children can safely experiment and strengthen their problem-solving skills as they build and race vehicles. 8+ years