This 20-400 polypropylene (P/P) continuous thread closure has a ribbed skirt and matte (stipple) top. In includes a .020 inch pulp/SG-90 plain (unprinted) liner. The liner is a two piece heat induction foil liner with a white pulp backing. After consumer opens package the first time, the pulp backing remains in the cap during use of product over time. This innerseal does provide the consumer an indication of tampering (tamper evidency). It is a good choice for sealing PET, PVC and some Barex containers. Note: Not recommended for use with glass containers.