I.C.E. darts are manufactured in Harrows laboratories in England. The purest 90% tungsten powder is fused with nickel, iron, and zinc using an Isostatic Cold Extrusion process to create a billet of unrivaled concentricity and uniform high density. Each barrel is individually machined to create unique radical shape, featuring reverse cut grooves for extra thrust and ultimate repeatable control. As a permanent reminder of the coolest darts on the planet, check out the individual laser marking on every barrel. 26 grams