Check the listing for details. 2pcs 68mm OD 48mm ID 1.0mm Thickness Air Compressor Piston Ring, Brown. Condition: New. Listed at 11.47 USD. Outer Diameter: 68mm / 2.68"; Inner Diameter: 48mm / 1.89"; Thickness: 1mm / 0.04"; Color: Brown; Packing Including: 2pcs x Air Compressor Piston Ring;Our air compressor piston ring is made of premium Polytetrafluoroethylene material, featuring self-lubricating performance, high sealing capability, and excellent wear resistance, eliminating the need for additional lubrication while helping reduce friction, prevent overheating and extend service life, making it a durable and reliable replacement part for long-term compressor performance.This compressor replacement ring is easy to install by first releasing pressure and disassembling the piston cylinder to remove the worn ring, then cleaning the piston cylinder and rod before fitting the new compressor piston ring, and finally reassembling all components securely to restore proper operation.