The L408BKH26 is a black HDPE plastic 24-400 ribbed skirt twist-open dispensing cap with LDPE plastic tip and printed heat induction seal (HIS) liner (for PVC and PET containers only). This closure comes with a heat induction seal (HIS) liner, already placed inside the cap. An HIS liner is a metallic disk that provides an airtight, tamper-evident hermetic seal when an appropriate heat induction sealing process is applied. This liner should only be paired with containers made of PVC and PET. This closure fits a container with a 24-400 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.