Darts Arrows Set Winmau Stratos Steeldarts 1055-24 g. The Tungsten dual-core darts from Winmau are probably among the most elaborate in production and equipped with the highest technical know-how products. Made from the purest raw materials and combined with groundbreaking sintering processes, Winmau has developed the world's first dual-density tungsten barrels. These darts are characterized by a combination of a unique mated 95 % tungsten alloy at the front and an 85 % alloy at the back and have been designed with the help of Computer calculations for dynamics and flight analysis developed through months of testing in Winmau's world-class research lab. A perfected innovation with the best flight characteristics, which thrills professional players in particular.