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Product Description To produce these super cool darts the purest 90% tungsten powder is fused with nickel, iron and zinc using an isostatic cold extrusion process called I.C.E. to create a dart with high density. Each barrel is laser marked and has reverse cut grooves. From the Manufacturer To produce these super cool darts the purest 90% tungsten powder is fused with nickel, iron and zinc using an isostatic cold extrusion process called I.C.E. to create a dart with high density. Each barrel is laser marked and has reverse cut grooves.