It is a friction electrostatic experimental equipment tool set for students, which is made of for and in use. It is simple design but practical in use, bringing much convenience to you. This professional teaching equipment for physics teaching can train the student's practical ability and their interest in learning. Features - ColorAssorted Color - Material: Glass, silk. - Size: 25.00X0.50X0.50cm/9.82X0.20X0.20inch. -Note: the cloth is random color - Manufactured with material which is and environmental friendly. - Put education in fun, cultivate scientific knowledge. Perfect for any school, or laboratory use - It is simple design but practical in use, bringing much convenience to you - It is interesting and allows students to better understand electrostatics in intuitive demonstrations and interesting experiments - Stimulate students' interest, improve analysis and observation skills, practical for teaching use Package list: 2 x cloths 4 x glass sticks