Conductive tube - it is manufactured with top-class material for and long-lasting use. Science experiment toy - and portable, easy to carry and store. Human body conductive bar - and compact, you can carry it with you. Toy - scientific experiment to exercise student's practical ability. bar - principle: the human body contains a lot of water and , so the human body can conduct electricity., Weight: 0.31085178942 Pounds, Manufacturer: Wesafrae