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.