Save your money and buy direct from Nissan. So Im not sure exactly what that means. The key rings give me sites on each side of the rack to attach the lower pannier hooks in order to keep everything tight and riding securely. Purchased these based on a glowing review of these headphones on a popular news and culture website that was sharing they were on sale. The metal racks are 3. Amazingly water tight. Las uso todo el año en casa y en el verano para ir a la playa. Metal gears not plastic. Pretty soft and comfortable. Buck or Lisa See.