NAME:PERKINS PISTON RING BRAND: JIN LING DIAMETER: 100 MM Materials: 1st compression ring: Ductile Cast iron, Molybdenum plated 2nd compression ring: Alloy cast iron, chrome plated 3rd oil rings: Alloy cast iron ADVANTAGE: GOOD QUALITY, COMPETITIVE PRICE, BEST SERVICE ALWAYS SATISFY YOUR REQUIREMENTSM