Mahle Rings Plasma Moly Steel Top Compression Ring 4.560in x .0625in .190in RW Moly Ring Set

When you're rebuilding the top end of your engine, getting the piston rings seated properly is key to good compression and oil control. These Mahle OE top compression rings are made from steel and feature a plasma moly coating, which helps them break in smoothly and resist wear over time.

The plasma moly coating on these rings is a notable detail. It's a hard, low-friction surface that helps the rings seat against the cylinder wall more effectively during the initial break-in period. This means you're less likely to have issues with blow-by or excessive oil consumption down the road. They measure 4.560 inches in bore size, with a 0.0625-inch ring width and a 0.190-inch groove depth.