Piston Rings, Performance Series, 4.030 in. Bore, File Fit, 1/16 in., 1/16 in., 3/16 in., 8-Cylinder, Set Please hover mouse to enlarge image Mahle Performance Piston Ring 4035ML Bore (in) 4.030 in. Bore (mm) 102.362mm File Fit Yes Gapless No Oil Ring Included Yes Oil Ring Material Stainless steel Oil Ring Tension Low Oil Ring Thickness 3/16 in. Quantity Sold as a set. Second Ring Facing Material Cast iron Second Ring Included Yes Second Ring Material Cast iron Second Ring Thickness 1/16 in. To