What kind of shaft did a pilum have?

A pilum, the Roman military throwing spear, typically featured a long, slender shaft made of wood, often measuring around 1.5 to 2 meters in length. The shaft was designed to be both lightweight and sturdy, allowing for effective throwing while also being durable in combat. The pilum's design included a metal head that was attached to the shaft, often with a socket or a tang, to enhance its effectiveness against enemy shields and armor. Additionally, some pilum shafts had a tapered end to facilitate easy handling and throwing.