WINMAU's Aspria Dual Tungsten features the latest CAD CAM processing technology. Made from Winmau's unique Dual Core fused billets, with 95/85% tungsten front-loaded darts ushering in a new era of dart design, craftsmanship and performance, finished with Genuine Gold Plating and Onyx Coating. This dart set comes in 2 weights; 21-23 grams. 21G = Barrel Length: 40.60mm, Barrel Width 7.90mm. 23G = Barrel Length: 40.60mm, Barrel Width 7.90mm.