Harrows Assassin Plus Darts Tungsten is used in the production of darts because of its high weight to volume ratio. The higher the percentage of tungsten the slimmer the dart will be. Assassin Plus darts are precision made from high grade tungsten with hi-tech shafts and aerodynamic flights. 80% Tungsten 24g Weapons Grade Tungsten Ultimate Tensile Strength: 1090 Density: 15.2g/cm3 Rockwell Hardness: 19-24 Colour: White Barrel percentage composition: 80% Tungsten, 15% Nickel, 3% Iron, 2% Zinc