Total seal Classic Race conventional ring set Big Block Chevy 454/ Bore size 4.280″ File fit set/ Top ring 1/16″ thickness ductile iron plasma moly face /Second ring 1/16″ thickness cast iron/Oil ring 3/16″ thickness stainless steel standard tension 20lb. Applications street ,drag ,circle track, mild nitrous, forced induction sold as a set. (Note check your piston ring grooves dimension before ordering.) Please e-mail with questions and available.