The Danny Noppert ONXY 90% Tungsten from WINMAU is a dart set with barrels of 90% Tungsten and its personalized darts from the Dutch professional darts player Danny Noppert. The Danny Noppert ONXY 90% darts are made in 2 weights; 23-25 grams. 23G = Barrel Length: 50.80mm, Barrel Width 6.40mm. 25G = Barrel Length: 50.80mm, Barrel Width 6.70mm.