The main purpose of this paper is to present the technology of hybrid tubes developed to reduce the mass of auxiliary lines of drilling risers used in ultra deep water, by replacing conventional choke and kill lines with lighter tubes. They are composed of a steel core hoop wound with a strip made of carbon fibers impregnated with a polyamide thermoplastic resin.The paper describes the structure of hybrid tubes, the design methodology and the manufacturing process. It presents all the tests carried out to qualify the technology and the conditions of the field test in preparation aboard a drillship offshore Angola. The principle of their integration in riser joints is described. Finally, the architecture of drilling risers including hybrid tubes is commented and their technical benefits are discussed.In conclusion, studies performed at IFP prove that hybrid tubes reduce the weight of auxiliary lines by 50% and that this technology is well suited for ultra deep drilling risers.