Sometimes you need to make a point! The corner on Shape 4 gives a beautiful line on the clay. This tool also offers two flat surfaces and three radiuses. Michael wants this particular polymer rib if he’s stranded on a deserted island. All of MUD's polymer ribs are made of unique flexible materials that are resistant to wear and the formation of burrs. We've found that with general use these ribs become burnished over time. This polymer rib shape is available in the following flexibility options: