This is a special woven fabric. It is a new development in carbon fibre reinforcement whereby a sophisticated production process spreads out each tow (bundle) of carbon fibres making them significantly flatter and wider than they would be in a conventional woven fabric. Spreading the tow in this way creates Ultra-Flat Strips of unsupported unidirectional carbon fibre which is then carefully woven to create a biaxial carbon fabric with an unprecedented flatness and a unique appearance. Blades with this material got UFS in their name.