Description: 【Interesting experimental tool】: Use it with your children to make a , which not only brings to the child, but also improves the child's ability to do hands on and cognitive science in the process of playing. 【Educational Helpers】: For school classes, home students, and any other group, this is a great tool for educational and fun experimental activities that stimulate a child's interest in learning scientific knowledge, laying the foundation for enhancing students' creativity! 【Easy to Use】: Fill the water first to two thirds of an empty bottle, then use the bottle connector to connect the two bottles, and it vigorously for three to five times. The you expect is formed, so easy. 【Various Tornadoes】: You can add dye or laundry detergent to the water in the bottle so that the resulting will have different colors and bubbles, which creates even more fun. 【Interesting Gift】: For kids, it is the great gift for birthdays, and other holidays. Specification: Material: PP  Size Chart: 3.7cmx4.9cm/1.46inchx1.93inch Package Includes: 1 Tube Bottle Connector Note: 1.This is not infant toy, please take away from children to avoid eating. 2.Please allow slightly errors due to manual measurement and different monitors.