These ribbed black polypropylene closures include an HSS-5.6/20 foam induction liner that reads "Sealed for Your Protection" on the top. The plastic caps must be applied with an Induction Cap Sealing System such as our Enercon Super Seal Jr. Here you'll find this style cap in sizes ranging from 20/410 to 28/410. These caps are offered in bulk at wholesale pricing for the best discounts to be paired with a variety of different containers with matching neck finishes.