MAHLE Original rings are at the forefront of light vehicle piston ring technology. Aazon.co: AHLEPerfect Circle 40564CP.040 oly Piston Ring Set... Steel compression ring technology has been used in heavy-duty applications for over 30 years. Only MAHLE Original can say that it is the largest manufacturer of piston rings in the world today. Find the right MAHLE Piston Ring Set for your vehicle at O'Reilly Auto Parts. Place your order online and pick it up at your local store for free Perfect Circle 40203CP.030 Mahle Original Premium Piston Ring Sets Things like the CP-20 oil ring, narrow compression rings, steel compression rings for gasoline engines, low-tension oil rings and coated compression rings for diesels all came from the OE. MAHLE Original piston rings lead the way in ring technology and innovation for the Aftermarket – after all, MAHLE is the largest manufacturer of piston rings in the world. Piston Rings, Plasma-moly, 4.280 in.Bore, 5/64 in., 5/64 in., 3/16 in.Thickness, 8-Cylinder, Set Clevite MAHLE Plasma-Moly Piston Ring Set 4.060 Bore Size 5/64", 5/64 Country of Origin : United States , Model Number : 40564CP., 030 , Package Weight : 1., 2 pounds , Package Dimensions : 2., 0 H x 10., 25 L x 5., 25 W inches