Manley stocks conventional style piston ring sets in both “Classic Race” and “AP Premium Steel top ring” versions. The Classic Race sets feature high-performance ductile iron with plasma moly top rings, reverse twist cast iron taper face or Napier style second rings (where noted) and three-piece oil rings. The AP Premium Steel top ring sets incorporate Total Seal unique and proprietary Advanced Profiling manufacturing capability. These Premium Steel top ring sets are ideal for high horsepower and forced induction/nitrous applications.