I hope to never use these cables, but the construction looks just fine, and the price was quite good. I bought two sets to put one in each of my wife's and daughter's cars. I'm fairly sure that if my wife needs to use them, she will figure it out, and if my daughter needs to use them, she will find somebody who will figure it out. I do recommend buying 6-gauge or heavier cables, as these are, especially if they are copper-plated aluminum wire, as these appear to be. Aluminum has a higher resistance than copper, so the same gauge cable will conduct less current. 6-gauge should be sufficient for small and medium cars, where the starting current is not tremendously high - it may not be sufficient for large trucks or tractors, especially in cold weather. Choose your gauge carefully!