The PKCR033K is a black ribbed non child resistant certified cap with a neck size of 33MM. This 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). This liner has a backing thickness of .025 and has "sealed for your protecting" in red on the top of the liner. This is an universal liner and works with both glass and plastic bottles. Used for dry products, milk, peroxide, fruit juice, glass cleaner, spices and nutraceuticals. Not good with oil or solvents.