Sigma 900 - 90% Tungsten Steel Tip Darts by UnicornUtilizing the mathematics behind UniLab, Sigma darts are designed so that the barrel, shaft and flights come together to form the ultimate aerodynamic unit. Every Sigma dart has been mathematically optimized, creating a range of darts with the truest flight and greatest accuracy. The combination of the distinctive conical barrel shape and the ultra thin taper at the nose of the barrel result in the ultimate aerodynamic dart! Precision cut square