The 13mm Snap-On Chlorobutyl Grey Stoppers (Pack of 100) are high-quality rubber seals designed to securely close pharmaceutical vials, serum bottles, and laboratory containers. Engineered to fit vials with a 13 mm outer diameter opening, these stoppers maintain sterility and prevent contamination of liquid contents. Made from durable chlorobutyl rubber, they offer excellent resistance to chemical degradation and provide a tight, reliable seal. Ideal for use in pharmaceutical compounding, clinical laboratories, and storage applications, this pack of 100 stoppers supports consistent, safe handling of sensitive materials.