Appears to be a good product as far as performance. Outboard motor running good. My issue is with NGK because the plugs came minus the screw on tips that allow connection to the plug wires. The old plug tips could not be removed or reused. Really NGK! Even the ad display shows a plug with a tip on it. Other than having to scrounge up some used plug tips before I could fire the motor up, I think the plug are ok.