NOTE: If we don't receive any size information from you, we will send the 5MM MODEL by defualt.. Highly polished, smooth, easy to clean, low abrasion to the equipment.. High mechanical strength, good toughness, impact resistance, no broken beads.. In order to prevent excessive abrasion, the hardness of the grinding jars used and of the grinding balls must be higher than that of the material used. Normally, grinding jars and grinding balls of the same material should be chosen..
