thunderbbs airsoft bbs 0.12, 0.20, 0.25, 0.30, 0.36, 0.38 gram, competition grade(airsoft gun) thunder bbs these high quality 6 mm airsoft bbs have extreme precision in terms of size and weights. they are double polished and super slick. they also have high hardness for jam-free aeg and gas powered airsoft guns. quantity per bag are 0.12, 0.20: 5,000 rounds; 0.25: 4,000 rounds; 0.30, 0.36 and 0.38: 3,000 rounds. package art works may vary but the product is the same.