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500 mL borosilicate Erlenmeyer flask (Boro 3.3) with narrow neck and clear molded graduations to 500 mL. Visible scale markings at 200/300/400/500 and a small circular manufacturer mark. Standard wide-base conical shape provides stability and easy mixing. Laboratory-grade glass suitable for chemistry, education, brewing, mixing, or decorative display. Hand wash and avoid sudden temperature changes to preserve markings and integrity.