... G1 /G0 certificate, highest industry standard!4) weight =0.25g 5) diameter = 5.95mm 6) Eco-friendly Materials ... Designed for tight high performance barrels - model: GB3025W, 0.25g, 5.95+/-0.015mm, white; 3000 Rounds/Bag, 20Bags ... blue; 3000 Rounds/Bag, 20Bags/Carton- model: GB4025BK, 0.25g, 5.95+/-0.01mm, black; 3000 Rounds/Bag, 20Bags ... 12g,0.20g,0.23g,0.25g,0.28g,0.30g,0.32g,0.36g and BIO-BB series etc. ...