... airsoft BB, high presion, seamless, roundness, polish 0.28g airsoft BB1) high precision, seamless, roundness, polish2) Perfect spheres ... 3290-2001 G1 /G0 certificate, highest industry standard!4) weight =0.28g5) diameter = 5.95mm6) Eco-friendly Materials and Mineral used7 ... ,or higer. ps: 6mm airsoft BBs, include 0.12g,0.20g,0.23g,0.25g,0.28g,0.30g,0.32g,0.36g and BIO-BB series etc. 25kg ...