Protect your pinch welds with our high quality Jack Pucks. They are made of AL 6061 and have been hard anodized black. They come with a Nylon insert on which the pinch weld sits. The Nylon insert has 3 magnets that hold the Jack Puck onto the pinch weld until you lift it with a Jack. It is made to sit in a 2.5-3" cup to ensure no car ever slips off the jack ever again. When done, simply pull the red tag to remove the Jack Puck and you are set.