Ta Tantalum - Tube

Tantalum is a gray, heavy, and very hard metal. When pure, it is ductile and can be drawn into fine wire, which is used as a filament for evaporating metals such as aluminum. Tantalum is almost completely immune to chemical attack at temperatures below 150°C, and is attacked only by hydrofluoric acid, acidic solutions containing the fluoride ion, and free sulfur trioxide.

Melting point: 3017 °C Boiling point: 5458 °C

A tube is a uniform strand of a pure metal with a hollowed core.