This is a child resistant certified cap with a neck size of 33MM. The cap has a HS035 pulp 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). The liner has a backing thickness of .025 and has "sealed for your protection" in red writing on the top of the liner. This is a universal liner and works with 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.