The L878WHH8 is a 38-430 white buttress cap with a heat induction seal (HIS) liner. This closure includes a HIS liner with a two-piece pulp backed heat induction foil inner seal that will provide a tamper-evident bond to polyethylene containers. Please read 5 seals and how they make perfect liners for your container for more information on liner types. This lid is made of white polypropylene (PP) which is highly resistant to heat and fatigue. This is a heavy-duty cap. This closure fits a container with a 38-430 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.