Item DescriptionLessen your worries when shipping or storing your hazardous liquids with Labelmaster's Polypropylene Bottle Caps With Teflon® Liners. Designed to fit a 16-oz. glass or poly bottle, these are typically used to contain analytical lab samples, high purity chemicals, strong acids solvents, environmental samples, pharmaceuticals and diagnostic reagents. These caps with friction-fitted liners have a mouth size of 28/400 and are sold individually.