This is a black Child resistant certified lid with a neck size of 33MM. 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). The liner has a backing thickness of .020. The liner has "sealed for your protection" in red writing on the top of the liner. This is a universal liner and works with both glass and plastic bottles. This is used for dry products, milk, peroxide, fruit juice, glass cleaner, spices and nutraceuticals. Not good with oil or solvents.