... presion, seamless, roundness, polish 0.25g airsoft BB,Brand"GoldenBall"1) high precision, seamless, roundness, polish 2) Perfect ... ! 3) ISO 3290-2001 G1 /G0 certificate, highest industry standard!4) weight =0.25g 5) diameter = 5.95mm 6) Eco-friendly ... ,0.28g,0.30g,0.32g,0.36g and BIO-BB series etc. 6mm 0.25g airsoft ...