The Shark Pro Ultralight 90% Tungsten from BULLS is a dart set with barrels of 90% Tungsten. The Shark Pro has been part of the darts range for years, but is also available in a light series, specifically for people who like light arrows. The Shark Pro Ultralight 90% Darts are made in 3 weights; 15-17-19 grams. 15G = Barrel Length: 45.30mm, Barrel Width 7.00mm. 17G = Barrel Length: 45.30mm, Barrel Width: 7.10mm. 19G = Barrel Length: 45.50mm, Barrel Width 7.00mm.