Feature●This item is used to measure and observe wind directions and wind speeds outdoors. You can use the natural wind to observe it●This weathering streamer has a reflective strap that makes it easy to see in the dark after the evening and can be used all day●Made of highly abrasion and water resistant material that is resistant to damage from the elements and sun and can last for a long time●This set of 4 wind observation streamers allows you to observe the wind direction and wind speed in multiple places●Size: Length: Approx. 31.5 inches (80 cm); Set Includes: 4 piece setDescription