90W Ø6.35x54.6mm tungsten nickel silver billet price is 2.20USD/PC on Nov. 07, 2018. The standard material for barrel is tungsten alloy billets, and barrel forms the main part of a dart (mainly used in sports). Tungsten has a specific gravity of 19, so it is a very dense material. For its special properties, nowadays tungsten is widely applied to make darts replacing brass. Because of technical difficulties with manufacturing, a 100% tungsten dart is not available. Most "tungsten" darts you can buy are in fact made of tungsten nickel silver billets.