This is a DIY solar car prop, adopting sturdy material, safe to use, simple to assemble, which can exercise students hands-on ability. A good and practical small science experiment prop, which can help them improve science thinking ability.Features-Color:Multi-color-Material:Metal, plastic-Size:11.50X6.50X5.50cm4.52X2.55X2.16in- The hardness of the material can keep it not easy to deform under normal wear.-The solar car model is simple to assemble, and can stimulate students hands-on ability.-This DIY solar car model is safe to DIY and playing. You needn't worry about its safety.- Characteristic and with DIY design. Simple and generous design, smooth in lines.-The good workmanship of our DIY solar car model will bring you a .Package list: 1 x bottom board1 x bracket1 x electrical machinery1 x solar panel4 x wheels2 x axles1 x machine cover1 x rubber band1 x pulley (size S)1 x pulley (size L)