For liquid storage where pouring is required, we offer a wide range of narrow mouth Boston Rounds in amber glass. Bottles are manufactured from Wheaton 900" glass, which meets USP Type III standards for light-sensitive samples. A variety of caps are sold pre-attached to the containers or are available separately. Cap and liner combinations include polypropylene with PTFE® faced polyethylene or polyvinyl liner, black phenolic with rubber liner, and black phenolic Poly-Seal® (cone) liner. Black phenolic cap with rubber liner is autoclavable.