Oxygen Sensor Set 4 Piece - Compatible with 2017 GMC Acadia Limited 3.6L V6

Each unit was in a sealed bag inside of a box. All threads had anti-sieze applied. Package allows units to be inspected before removal to verify the plug type. These were bought to replace another brands replacements that had failed after one year of use. The build quality seemed more robust than the others and on par with the GM units. GM units were just way too expensive to even think about buying. Time will tell if these TRQ brand are better. Corrected my problem.