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The Mahle OE moly top ring set is a plasma-steel piston top ring with an HVOF molybdenum surface sized for a 3.909 in bore, 1.0 mm thickness and .143 in ring width. Sold as an individual set, it provides the exact ring-section dimensions needed for piston rebuilds and replacements calling for a 3.909 in HVOF moly top ring specification.
Mahle Rings Performance Plasma Steel Top Ring 3.909in x 1.0MM .143in RW HVOF Moly Ring Set
