1KG pack of 3500 (approx) 0.28g high quality precision bbs. Perfect for any hi-end BB Rifle. High Grade Airsoft BBs by Ares Amoeba – match grade with a 5.95 +/- 0.01mm tolerance. With BB’s air bubbles can form inside during the cooling process. The slower the cool down period, the fewer the bubbles meaning balance and accuracy are improved giving the BBs a better trajectory. Ares Amoeba BBs have less than 5% internal bubbles, the best in its class.