17g/cc density. 90% Tungsten, 6% Nickel, 4% Copper. High quality tungsten heavy alloy (W) rod in 0.25" (1/4") diameter x 12" length conforms to international standard ASTM B777, Grade 1, Type II & III. You will receive a complementary material cert in the safely packaged shipment. All material is lot controlled, stress relieved, and formed through high temperature pressing and sintering processes. This rod is perfect for machine shops, labs, research and development, and DIY machinists. Tungsten alloy is much easier to machine than traditional pure tungsten. Also check out our Pure Tungsten and Molybdenum rods!