Harrows ICE Soft Tip Tungsten Darts. The purest 90 percent tungsten powder is fused with nickel, iron and Zinc, using an Isostatic Cold Extrusion process (I.C.E), to create a dart of unrivalled concentricity and uniform high density. Each barrel is individually machined to create a unique radical shape, featuring reverse cut grooves, for extra thrust and ultimate repeatable control. Harrows I.C.E. Darts - Soft Tip Tungsten - ICE - Blizzard