RWA1565 2.0 piston ring set is manufacture by Total Seal. These are the "classic" style that are file fit, not to be confused with the Total Seal "gapless" ring set. We also offer the gapless rings RWA1566. Classic race sets feature Ductile plasma moly top rings, conventional reverse torsional taper face 2nd rings and flex vent style 3 piece oil rings. We supply the rings with a .005" oversize to facilitate proper ring end gap.