Abstract: A friction disc is described for very quietly driving twist tubes at several hundred thousand revolutions per minute in a false-twist device for texturing synthetic filaments. The disc has a titanium alloy support flange having a specific electrical resistance of between 1 and 2 .OMEGA./mm.sup.2 /m, a modulus of elasticity of at least 6500 kg/mm.sup.2 and an ultimate tensile strength of at least 25 kg/mm.sup.2. The support flange has a circular cylindrical circumferential surface which fits and is rigidly fixed to the internal surface of a polyurethane friction ring, the external cylindrical surface of which frictionally drives the twist tube. A twist tube driving roller has two such discs spaced apart on a steel driving shaft.