STEM Kits for Kids Ages 8-10-12-14, Stem Toys For Boys Age 8-12, Science Projects For Kids Ages 8-12, Solar Car Building Kits for Boys, Activities Engineering Kit, Gifts For 8 9 10 11 12 Year Old Boys

【4 different toy sets individually packaged】: 4 different STEM toys with 3 different motors which can Powered by the Sun or Battery for your child to build, including solar plane, solar car, wind power car and electric fan. Adorable toy that keeps kids happily engaged for hours.
【2 Solar Toys-No batteries needed】: Powered by the sun,no batteries needed.The 2 Solar kits with 2 types speed motors include 2 solar power panels that collect solar heat energy into an electric energy drive motor, which drives the pulley to make the car/fan run smoothly.
【NO Welding NO Screws-Kids complete it by himself】Board assembly and circuit connection are very simple, no welding,no screws,each toy is individually packaged, can be assembled after one and then the next, suitable for kids to complete independently.Repeatedly tested high-precision wooden parts and Detailed instructions make it much easier and convenient to assemble the models.
【Stimulate children’s interest and curiosity】With various 3D wooden puzzles, solar panels, battery box, tires ,shaft and motors for children to assemble 4 different styles of models! Kids will be excited and proud of their own projects that actually moves.
【Safety Tested material and full refund without reason】 The 4-in-1 STEM toys are tested at rigorous lab on regular basis. With non-sharp Edge, it is high-quality, non-toxic, tasteless and safety materials. These parts are easy to assemble and let children focus on the construction process.