• Piston rings designed to seal the combustion chamber and channel heat from the piston to the cylinder. • Compatible with air compressors. • Includes 2 balance rings and 1 seal ring. • Inner diameter of the seal ring: 49 mm (1.9 inches). • Outer diameter of the seal ring: 53 mm (2.1 inches). • Thickness of the seal ring: 3.2 mm (0.13 inches). • Thickness of the balance ring: 2.5 mm (0.1 inches). • Material: Metal, Color: Black. • Total package weight: 23 g. • Ideal for maintaining the optimal performance of your air compressor.