TC Motor 88mm piston ring kit designed for use with GX390 13HP engine and 188F 13HP engine.Includes a complete set of piston rings sized 88mm to fit specified engine models.The kit provides replacement rings for engine rebuilds or performance maintenance.Rings are engineered for proper compression and oil control in small displacement engines.Suitable for use in requiring standard 88mm bore size. Notice: This replacement item is produced by an independent supplier.All brand and model mentions are for compatibility purposes only.