"Sold per meter - 7mm Fuel line is the pressurized line for fuel delivery to and around the engine. It is not the fuel line that is used for the tank breather system.We recommend this German rubber line for the pressurized lines. Although originally 7mm line and we label this as 7mm line we are most satisfied with a BMW hose that is labeled 8mm although it measures as 7mm - It is thick, high quality, and a perfect fit. 4 meters is enough if you are doing the whole car. Use the non-serated clamps with the rubber hose. "