The Pyrex #27 Penny Head Ground Glass Stopper is a high-quality lab supply made in the United States by the reputable brand Pyrex. This glass stopper is designed for use in various scientific and medical applications, providing a secure and reliable closure for lab equipment or containers. Its mint condition ensures that it is ready to be used for precise and accurate experiments or procedures. With its durable construction and precise design, this Pyrex stopper is a valuable addition to any lab or healthcare setting.