Xntun 15 pcs Vortex Bottle Connectors for Children's Scientific Experiments and Tests Tornado Connector Cyclone Tube, 5 Colors

Xntun 15 pcs Vortex Bottle Connectors for Children's Scientific Experiments and Tests Tornado Connector Cyclone Tube, 5 Colors

• Quantity: 15 pcs of tornado connectors , and they can be applied repeatedly, enough for your common use.
• Material: made of plastic; Color: red, green, blue, yellow and purple, the surface of connectors has stripes, thus much easier for you to rotate.
• Educational experimental supplies: good educational and fun experiment and activity for school classes, home school, scouts and any other group, stimulating kids interest to physics and study.
• Convenient for using: apply the cyclone tube to connect 2 bottles with approx. one third water, then shake them for 4 to 5 times in horizontal direction, and you will see your tornado spin in the bottle.
• Note: you have to take the food-security ring off of your bottles to get these to catch the threads.