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Airsoft pellets (known as BBs) are spherical projectiles used by airsoft guns. Typically made of plastic,[1] they usually measure around 6 mm (0.24 in) in diameter (though selective models use 8 mm),[1] and weigh 0.20–0.40 g (3.1–6.2 gr), with the most common weights being 0.20 g and 0.25 g, while 0.28 g, 0.30 g, 0.32 g and 0.40 g BBs are also commonplace.[1] Though frequently referred to as "BBs" among airsoft users, these BBs are not the same as either of the 4.5 mm metal projectiles that BB guns fire,[2] or the 4.6 mm (0.180 in)-sized birdshot from which the term "BB" originated.[3]