Once again, Ethic has a fantastic design and reinvents the double clamp. This is the only steel clamp on the market, it has been made as minimalist as possible, which is the lightest clamp there. - Heat treated steel - Diameter: 31.8mm - Weight: 44.3g This is the only steel clamp on the market, it has been made as minimalist as possible, giving the lightest clamp. Once again, Ethic has a fantastic design and reinvents the double clamp.