Initial javelins were made of wood until the mid-1950's.
Dick Held improved javelin aerodynamics and durability by introducing aluminum javelins around that time (his brother, Bud, was the world-record holder for a time). Current javelins are made of steel, aluminum and/or carbon fiber.
iron
wood and iron
Steel, aluminum and/or carbon fibre.
Javelins believe it or not, are members of the rodent family.
no
It is made from carbon fibre because it is lighter so it will stay in the air for longer
javelins
No
<http://www.javeland.com/> is a reliable site for high quality javelins of various weights and makes.
Yes
Yes
800g