They are sold as a set of 2! Blackburn Camber UD Carbon Bottle Cage Carbon layup. I used them maybe twice, years ago and have been stored in my house untouched. Some signs of wear and looks like new. Does not come with screws. They are around 26.3-27.2 grams each. Below is the item description from Blackburn: Camber UD Carbon Cage Blackburn understands that we want to save weight wherever we can. Its sleek-looking Camber Carbon Cage uses unidirectional fibers to offer a claimed weight savings of between 11 and 17 grams when compared to steel and alloy cages. The Camber’s rib cage design keeps the bottle secure, while its flared opening offers you quick and easy access, so you can keep your eyes on the road.