This CP piston and ring set is described as a custom piston set for the Mitsubishi 4B11 Evo X, with an indicated bore of 89.5mm and supplied as a set of four. The listing emphasizes custom pistons matched to the 4B11 Evo X application and is intended for builds that require pistons made to the stated bore dimension and set configuration.
CP Piston & Ring Set for Mitsubishi 4B11 Evo X - Bore (89.5mm) - Set of 4 (Custom Pistons)