0.375 (3/8 inch) x 4 inches, Tungsten Copper Alloy 75W-25CU Round Rod, ASTM B702 Class D

Tungsten Copper Alloy is a composite material made from a combination of tungsten and copper. The composition of 75% tungsten and 25% copper gives this alloy excellent thermal and electrical conductivity, good resistance to wear and erosion, and high strength and hardness. Tolerance on diameter is (+/-0.003) i.e. 0.372 to 0.378