ECSiNG 2pcs 55x1.2mm Engine Piston Rings 503 28 90-53 Compatible with Husqvarna 390 390xp

["Part Number: 503 28 90-53.","Compatible with Husqvarna 390 390xp chainsaw.","In its natural state, the piston ring outer diameter is 57.5 mm, the inner diameter is 53 mm, and the ring width is 1.2 mm; the closed-type piston ring outer diameter is 55 mm and the ring width is 1.2 mm.","Made of steel, high temperature and wear resistant, long service life.","Used for engine piston sealing, effectively preventing air leakage and oil seepage, maintaining cylinder compression pressure."]