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The UGears STEM LAB is a NEW collection of educational mechanical models for children and adults that will give you a hands-on experience and make you more familiar with a science like physics or engineering. Learn about items of common use like gears and transmissions as well as their practical application in real life. STEM LAB model kits provide you with many hours of pleasure, turning the acquisition of knowledge into a joyous experience for both children and adults. THE MECHANISM OF GEARBOX IS COMPOSED OF: gear shifting lever layshaft with gear couplings reverse idle gear bearing drive shaft actuator handle Model size: 5.1 * 3.9 * 4.3 in (13 * 10 * 11 cm) Package size: 8.1 * 7.4 * 2.5 in (20.5 * 18.8 * 6.3 cm) Parts count: 120 Assembly time: hrs: 1-2