The PKCS058KHS is a black smooth non child resistant certified cap with a neck size 58MM. This cap has a HS035 foam liner (HS035 is an induction seal liner and is used with induction sealing equipment. A thin layer of liner material is electromagnetically activated by the induction sealing machine). This liner has a backing thickness of .020 and has "sealed for your protection" in red on the top of the liner. This is a universal liner and can be used on both plastic and glass bottles. This is used for dry products, milk, peroxide, fruit juice, glass cleaner, spices and nutraceuticals. Not good with oil or solvents.