I was at my Sno-Way dealer yesterday, had a switch go bad in a control box, I was picking up a replacement. (By the way, I keep a complete spare box, just in case. This time teh switch got crushed when the box was behind the seat, pure human carelessness) I brought up the subject of urethane edges. Sno-Way offers some sort of white "plastic", supposed to be urethane,stuff. Whatever it is, it apparently is NOT the stuff Vince is selling. Reports have it that if you catch a manhole cover it will take a chunk right out of these edges. About an inch thick, prebeveled and factory drilled. Nobody is using them because they haven't held up. I have no doubt about what Vince adn Dino are telling us about their edges durability, so is there different grades of urethane, with some not suited to the abuse of plowing?