The ultimate aerodynamic Sigma 900 is here. Sigma darts are designed so that the barrel, shaft, and flights form a unique aerodynamic unit. The Sigma shape has been mathematically calculated to achieve optimal flight characteristics. It is made from 90% tungsten. In addition to its aerodynamic shape, the barrel features an aggressive grip. The striking Sigma engravings are another highlight of this dart. The special Sigma One Shaft and Sigma 900 Flight provide additional stability during the flight phase. Available in weights ranging from 21 g to 25 g.