These narrow-mouth bottles are ideal for solvents, chemicals and sample storage. They are manufactured from Wheaton 800" glass, which meets USP Type III standards. 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 poly-vinyl liner, black phenolic with rubber liner, and black phenolic Poly-Seal® (cone) liner. black phenolic cap with rubber liner is autoclavable. All bottles come with Hazard Communication/Content Identification label.