Airsoft pellets are spherical projectiles used in airsoft gun models. Typically made of plastic, they usually measure around 6 mm in diameter, though select models use 8 mm and weigh 0.12–0.48 g, with the most popular weights being 0.12–0.20 g. While airsofters almost always call them BBs (bearing balls), they are not the same as the 4.5 mm projectiles that BB guns fire.