Feature:1. This piston ring set is suitable for Honda GX390 GXV390 188F 13HP.2. The 3 piston ring ports cannot be on the same side (it is better to stagger 120 in order), and the piston ring ports need to stagger the piston pin holes.3. The piston ring has been installed and tested, can run at high speed and load, and is durable.4. This gas engine piston ring is made of alloy material, with high hardness and strength.5. The generator piston ring set is simple to install and easy to use.Specification:Item Type: Piston Ring SetMaterial: AlloyPurpose: Air-cooled diesel generator piston accessoriesSuitable Model: Suitable for Honda GX390 GXV390 188F 13HPPiston Diameter: Approx. 88mm / 3.5in.Thickness: Approx. 2mm / 0.1in4mm / 0.2inPackage List:3 x Piston Ring