Item Type: Friction Electrification Toy Material: Plastic+PVC PVC Rod Length: Approx. 24cm/9.4in Applicable Age: Over 5 years old Ability Development: Intellectual development Experiment Type: Physics Features: The rubbed object has the property of attracting light and small objects, which is the phenomenon of friction electrification. Its essence is the transfer of charge. Weight: Approx. 130g/0.3lbs Package List 4 x PVC Rods 4 x Furs 4 x Accessories 4 x Pack of Small Ball 1. Please allow 0& 8209;2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 1Let children learn some scientific knowledge while playing, expand scientific knowledge and promote children's intellectual development. 2Excellent handeye coordination and concentration toys can help them think, increase creativity and interest in learning. 3The detachable teaching equipment makes teaching simple, so that children's classrooms are no longer boring. 4The toy assembly process can cultivate children's operational skills and logical theory. 5A great DIY educational toy, suitable for children and students to gain a sense of accomplishment and learning knowledge in the entertainment process.