These Glass Stirring Rods come in a pack of 10 and are 6mm in diameter and come in various lengths. They are a great way to stir or blend chemicals together without having to worry about contamination or reaction to a metal imparting taste into a product. ***Glassware Safety Disclaimer: Best Value Vacs is not responsible for failure of glassware which must be inspected before and after every use because it may eventually develop imperfections or damage through normal usage, mishandling, and stress caused by temperature variations. If an imperfection or damage is noted while inspecting the glassware DO NOT use the glassware because it can fail causing bodily harm or damage to the surrounding area.***