Probably just Chinese rubber. Even the good blades only last a year down here in the heat. When I have the annual inspection done on the truck, I have them put new wiper blades on. Then I'm good for another year.rear wiper making noise (chattering) on first use ..picking up a replacement blade for new rear wiper ...the blades that come with the kit are junk don't know if that are just old from long term storage or just cheap or both...for $176. At least they should send a a good blade just sayng.