The L070 is a black phenolic 18-400 lid with LDPE polycone liner. This cap comes with a polycone liner, a built-in low density polyethylene (LDPE) natural-colored conical-shaped liner that provides a tight seal. This lid is made of phenolic, an industrial grade, highly rigid, plastic with a good resistance to solvents and high temperatures. This closure fits a container with a 18-400 neck finish. The first number refers to the diameter of the container's opening (in mm). The second number refers to the thread/style/depth of the closure's skirt. Please read 5 seals and how they make perfect liners for your container for more information on liner types.