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In page Boomerang:

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Boomerangs are mostly used for recreation today. Modern boomerangs used for sport can be made from Finnish birch plywood, hardwood, or plastics such as ABS, polypropylene, phenolic paper, or carbon fibre-reinforced plastics. Most sport boomerangs typically weigh less than 100 g (3.5 oz), with MTA boomerangs (boomerangs used for the maximum-time-aloft event) often under 25 g (0.88 oz).[citation needed] There are different types of throwing contests: accuracy of return; Aussie round; trick catch; maximum time aloft; fast catch; and endurance (see below).[citation needed]