I.C.E. 90% tungsten darts are super cool, literally and figuratively. To make this dart series, we fuse the purest 90% tungsten powder with nickel, iron, and zinc through an Isostatic Cold Extrusion Process (I.C.E.). The darts also include reverse cut grooves, providing ultimate control and coherency. Fitted with Marathon flights and Supergrip shafts. Pro rating: expert.