94.5mm Piston Ring Set OE 23040-4Z900 K6Z1-11-SCO OK6Z1-11-SCO Premium SR CR SR Material for JS K2700 Diesel Engine Describe: The KIA JS K2700 94.5mm Piston Ring Set is manufactured using a premium SR (Steel) compression ring, CR (Cast Iron) scraper ring, and SR (Steel) oil control ring material combination — designated as SR CR SR — to deliver the ideal balance of high-temperature strength, scuff resistance, and long-term dimensional stability required for diesel engine