A fine tungsten rod with a diameter of 1.0 mm and a length of 38 mm is a small bar made of high-purity tungsten, 

Tungsten heating rods are electric heating elements made from high-purity tungsten material, 

The barium tungsten cathode is a high-performance thermionic cathode composed of a porous matrix filled uniformly with barium salts.

The WL20 lanthanum tungsten electrode is a tungsten-based alloy electrode material that contains approximately 2% lanthanum. 

The 70WC30Cu tungsten carbide copper rod is a composite material typically composed of 70% tungsten carbide and 30% copper. Due to the unique combination of tungsten carbide and copper, this material possesses exceptional physical and chemical properties.

Tungsten alloy dart billets are produced using a powder metallurgy process, combining materials such as tungsten, nickel, iron, and copper. 

Black tungsten wire is a fine wire made from tungsten material, known for its excellent electrical conductivity and high-temperature resistance. It is widely used in electronic components, filaments, vacuum devices, and high-temperature furnaces.

The 0.8mm mosquito-type tungsten filament is a specially designed filament, typically used in devices such as electron guns or displays. 

A tungsten retaining ring is a precision-engineered component typically made from tungsten. 

Silver-tungsten rod is a composite material made from silver and tungsten, combining silver's high electrical conductivity with tungsten's high hardness and wear resistance.