This length of metal is weighted to keep the spike at its tip foremost as it sails through the air.
Javelins are a type of ranged weapon. They deal 3-11 damage (clumping 3), meaning 7 points of damage on average and have a strength requirement of 15. While intended to be thrown, you can wield them as a melee weapon if you have no better option. They are never cursed, enchanted or runic.