Description: Windsock -Stop Outdoor Wind Measurement Sock Bag with Reflective Belts GrommetUsed in Meteorology, Chemical Industry, Environmental Protection, Agriculture, Oil Exploration and Other Industries. Wind Is Indicated by The Windsock's Angle Relative to The Mounting Pole; in Low Winds, The Windsock Droops; in High Winds It Flies Horizontally. Bright Orange and with Reflective Fluorescence Belts DesignEasy to Fly and Portable,Easy To Install: A 3-Position Twisted Polyester String Bridle with Heavy Duty Snap Swivel Is Attached for Easy Hanging. Specification:Material: Waterproof oxford clothColor: OrangeThe Length is optional, 80cm/ 30",100cm/39.37" 150cm/59.05"Package Includes:6 Pieces WindsockNote:The color may have different as the difference display, pls understand.Please allow 1-3mm error due to hand test.