Introducing the Nalge Nunc Closures designed specifically for NALGENE Micro Packaging Vials. These closures are made from high-quality PPCO material, ensuring durability and a secure fit. Each closure is sterile, making them ideal for laboratory use and sensitive applications. The NALGENE 342820-0117 natural closures provide an excellent seal to prevent contamination, keeping your samples safe and intact. Perfect for researchers and professionals, these closures are easy to use and compatible with various NALGENE vials. Elevate your lab's efficiency with reliable and effective sealing solutions!