These weights worked perfectly! They cut easily with scissors and the self adhesive strip held in place. They also take paint wonderfully, the cut edge does not take the paint as well but the flat surface takes it as well as the wood. The weight is not marked but with a little math you can figure out easily how much to cut to get the exact weight you need. We will be buying these each year for the pinewood derby. So much easier than trying to hot melt glue on the right amount of weight... plus these can be cut into shape so the car still looks cool.