<b><br>Specifications:</b><br> <br>- Material: Plastic <br>- Size: 1.3 x 1.9 inch <br>- Color: Purple, blue, red, green,yellow <br>- Weight:Each 20g<br> <b><br>Packaging includes</b><br> <br>- 8 x Tornado connectors <br> <br>- Good educational and fun experiment and activity for school classes, homeschoolers, scouts and any other group, stimulating kids interest to physics and study. <br>- Create a tornado from plastic bottles, water and a colorful plastic connecting tube. <br>- Great educational toy for your kids, Perfect Christmas Gift / Birthday Gift. <br>- You have to take the food-security ring off of your bottles to get these to catch the threads. <br> <b> <br>If you have any questions, please contact us and we will reply at the first time.