Features: Reliable material: made of quality ABS, the tornadoes connector is durable and long lasting; The surface of connectors has stripes, thus much easier for you to rotate, it can serve you for a longer time Educational:With a tornadoes tube, you can make and watch the amazing tornadoes with your friends together. A nice present: The vortex water bottle connector can help increase the intelligence of the kids, stimulating kids interest to physics and study; It is also a fun birthday present for your kids Colorful tornadoes: you can put safe coloring agent into the water in the bottle, so that the little tornadoes you create has different colors and bubbles, which is more interesting Fun experiment activity tool:This tornadoes tube kit is an educational and interesting experiment activity tool for school classes and clubs. Notice: Actual color may be slightly different from the image due to different monitor and light effect Please allow 1-3cm deviation due to manual measurement Specification: Material:ABS Age:3-12 yaers old Size:Diameter: 37mm Height:49mm Thickness:5mm Package List: 1x Tornadoes Connector