No, they are made in Chattanooga, TN by Andersen Flaps (Barry Andersen, Pres. is the inventor, his wife Rosemary is the VP). Dupont supplies the nylon resin pellets we use in the injection molding process.
I forgot to mention that we ship the flaps directly to you via FedEx Ground and since the flaps are 3.5 - 4.5 lbs in weight, the freight charges are not severe.
Jonas