I was told my alloy heads are 13kg each. They weight saving on the frontend and more the steering is nicer.
 I'm not sure of their exact weight but I struggle to carry a 2V cast iron head. I can carry my CHI 3V head in 1 hand like a small tool box without effort. I don't think they feel like they weight much more than 10kg each. When I took my heads back to CHI for repair I carried one per hand and had my son sitting on one arm aswell