The Mahle OE plain ring set is a performance steel Napier THM-13 piston ring package sized 4.130 in with .043 in thickness and .135 ring width. As an individual plain ring set, it provides a direct replacement choice for piston sealing and compression control in engine rebuilds specifying these exact dimensions.
Mahle Rings Performance Steel Napier THM-13 4.130 x .043 .135 RW Plain Ring Set