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Mahle OE plasma-moly top compression ring set, 4.000" diameter by .0625" thickness with .190" RW dimension as listed. The part is a steel top compression ring with plasma moly treatment for engines requiring the exact 4.000 x .0625 specification. It’s marketed for accurate replacements during piston and ring service where OE-style geometry is needed.
Mahle Rings Performance Plasma Moly Steel Top Compression Ring 4.000 x .0625 .190 RW Moly Ring Set
