Double the Masts Double the Fun. Active Nets are a great way to allow multiple users to play at the same time helping build social skills as well as learning how to master the different types to climbing to either get to the top or simple traverse around or even just hang out. With such a large play space to be used both in height and width it s great for a well populated area given a lot of play value to any area. Also available in 5m and 6m Twin Masts. Available in multiple colour options.