These reinforcements are for use on the German gas can for the three attachment points to prevent wear on the strap. I have seen this style sewn on to the strap and around the loop on the can. It keeps it from rubbing but also stops you from ever adjusting the strap again. It can also be left loose and the leather will conform to its regular position. These are from around 3 to 6 Oz leather depending on what I have laying around. It also has a makers mark copied from an original. Made in USA