Vortex ขวดเชื่อมต่อ Tornado ในขวดน้ําพุของเล่นเพื่อการศึกษาวิทยาศาสตร์

Color: Blue, red, yellow, purple, green Total size: 4.8x 3.1cm(common size for most bottles) Material: Plastic Features: This is a great educational and fun experiment and activity for school classes, homeschoolers,scouts and any other group. Create a tornado from plastic bottles, water and a colorful plastic connecting tube. Package Includes: 1x bottle connectors(The bottle is not included)