Power kit education-- this hand crank generator is a great educational toy, children can use for physical experiment, which enhances the child's care and patience. Generator science kit-- it is easy enough for students and kids to explore in advance and get interested in physics science. Education science kit-- this science crank generator is demonstrating the energy transformed from mechanical to electrical. Electricity generator crank-- the crank generator is a safe and interactive experience that keeps kids engaged, nice electricity learning toys for children. Scientific experiments for children-- -[for education] the hand-cranked generator is suitable for school physics and electricity education, allowing to know more about electricity. Material: plastic+metal colour: As Shown Package Contents: 5 x DIY Model Generator Electricity Generator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.