... /G0 certificate, highest industry standard!4) weight =0.20g 5) diameter = 5.95mm 6) Eco-friendly Materials ... for tight high performance barrels - model: GB3020W, 0.20g, 5.95+/-0.015mm, white; 4000 Rounds/Bag, ... 4000 Rounds/Bag, 20Bags/Carton- model: GB4020BK, 0.20g, 5.95+/-0.01mm, black; 4000 Rounds/Bag, ... 20Bags/Carton- model: GB4020GR, 0.20g, 5.95+/-0.01mm, green; 4000 Rounds/Bag, ...