<https://windwerks.com.au/product/flightsock-150cm/#product>
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"The Flightsock is a 1.5m wind indicator with a 35cm solid ring opening suitable for light aviation purposes and a great portable option for both planes and helicopters. Made from tough 500 denier solution dyed polyester, rot proof; high UV resistance, this windsock is triple-stitched with acid resistant thread throughout and Dacron reinforcement where it’s needed most – at the bottom opening.\r\n\r\nThe sock's bridles are Marlin line cord for extra strength, topped with a heavy duty pre-lubricated swivel. Note: adjust the bridle length to your needs and your secure swivel.\r\n\r\nThe Flightsock can be teamed with one of our stainless steel Tanglefree Pivots, which allow a sock to hang clear of the pole and swing freely in a 360 degree arc, providing accurate wind direction indication without tangling and premature wear of your wind indicator.\r\n\r\nLimited Stocks\r\n\r\n3 colours\r\n\r\n \tYellow\r\n \tWhite\r\n \tOrange - neon orange old stock - (to be discontinued)\r\n\r\nProudly designed and handcrafted in Australia. All our Windwerks products are unique and hand crafted with love, so no two are exactly the same."
<https://windwerks.com.au/product/flightsock-150cm/>