The Chemglass 50mL Round Bottom Flask with a 24/40 Outer Joint, model CG-1506-02, is a heavy wall laboratory flask designed for various disciplines such as physical, dental, medical, microbiological, and biological laboratories. Made in the United States, this high-quality flask is ideal for precise measurements and scientific research applications. With no expiration date and a unit quantity of 1, this flask is a reliable and durable tool for professionals in the healthcare, lab, and dental industries.