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βͺ Glass Ball Diameter: Approximately 3.5 centimeters, precise size for perfect compatibility and functionality π Material: Made of lead-free high borosilicate glass β features high temperature resistance, high hardness, and not easy to burst π100% cosmetic inspection of eachindividual tube favours high yieldrates all along the value chain. π₯A low coefficient of expansion ensures a high temperature resistance, as well as thermal shock resistance. π‘οΈThe chemical composition of borosilicate glass provides it with a strong hydrolytic resistance and durability to corrosive substances. π¦ Package: Includes 2 pieces β convenient for daily use or replacement