This equipment is made of high-class , sturdy materials that can withstand of use. Students can use it freely during the physics experiment and won't worry about it breaking easily. It is perfect for conducting friction electrostatic experiments, which are a common experiment in junior high physics. Features -Color:Blue -Material:Organic glass and lint - Size: 25.00X0.70X0.70cm/9.82X0.28X0.28in -Note: The style and color of the lint cloth is random. -After use, the equipment should be placed in a well-ventilated and dry location. -It is important to avoid storing it in a damp or humid area to avoid damage. -The equipment can be used repeatedly, making it extremely cost-effective. -With the use of this equipment, students can learn about the of static electricity in a practical and hands-on manner. -When used properly, the equipment can lead to a greater understanding of the physical principles the behavior of static electricity. Package list: 8 x Glass Bars 1 x Lint