Engino- Stem Toys, Pulley Drives Construction Toys For Kids 9+, Educational Toys, Gift For Boys & Girls (8 Model Options), StemWith Engino' s mechanics: pulley drives set learn how pulley drives can be used to transfer force with reduced friction and how they can increase force or speed at amazing levels. Pulleys have been used for thousands of years and are essential parts of complex machines in modern times, solving many technological problems. Build 8 working models such as a material lift, a stationary bike, a crane bridge, a blender, a construction crane and a windmill.