In general, a men's javelin weighs in at 800 grams and a women's javelin at 600 grams. This is not true across the board. Some rules organizations vary allowed weights by the thrower's size and age.
I wouldn't say that the javelin throw is unpopular. It is a sport that is very difficult to master and not very many people can become good at it. It is a sport, in the United States at least, that doesn't get much attention because of all the other sports that are played here. And that might be the reason other countries do not pay much attention to javelin. They are watching football and tennis and cricket more than they are watching javelin.
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