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⚪ Glass Ball Diameter: Approximately 3.5 centimeters, precise size for perfect compatibility and functionality 💎 Material: Made of lead-free high borosilicate glass — features high temperature resistance, high hardness, and not easy to burst 🔍100% cosmetic inspection of eachindividual tube favours high yieldrates all along the value chain. 🔥A low coefficient of expansion ensures a high temperature resistance, as well as thermal shock resistance. 🛡️The chemical composition of borosilicate glass provides it with a strong hydrolytic resistance and durability to corrosive substances. 📦 Package: Includes 2 pieces — convenient for daily use or replacement