Cord comprising a single layer of helically wound metal filamentary elements, each metal filamentary element of the layer describing, when the cord extends in a substantially rectilinear direction, a helical path about a main axis substantially parallel to the substantially rectilinear direction, such that, in a section plane substantially perpendicular to the main axis, the distance between the centre of each metal filamentary element of the layer and the main axis is substantially constant and identical for all the metal filamentary elements of the layer, characterized in that: - 5 GPa ≤ M 1 ≤ 16 GPa, and - 40 GPa ≤ M 2 ≤ 160 GPa, and - 3 ≤ M 2 /M 1, M 1 and M 2 being expressed in GPa, where: - M 1 =10 / A 100, where: - A 100 is the elongation, expressed in %, of the cord under a load of 100 MPa, and - M 2 =[(F 40 -F 30) / (A 40 -A 30)] / S, where: - S is the cross-sectional area, expressed in mm 2, such that S=MI /Mv, where: ▪ Ml is the linear density of the metal filamentary elements, expressed in g per m of cord, ▪ Mv is the mass density of the metal filamentary elements, expressed in g per cm 3, - F 40 is the force, expressed in daN, equal to 40% of the theoretical maximum force F t of the cord, - F 30 is the force, expressed in daN, equal to 30% of the theoretical maximum force F t of the cord, - A 40 is the elongation of the cord, expressed in %, at 40% of the theoretical maximum force F t of the cord, - A 30 is the elongation of the cord, expressed in %, at 30% of the theoretical maximum force F t of the cord, where F t = Ml x Rm /Mv, expressed in daN, where Rm is the mean tensile strength, expressed in MPa, of the metal filamentary elements making up the single layer. - 5 GPa ≤ M 1 ≤ 16 GPa, and - 40 GPa ≤ M 2 ≤ 160 GPa, and - 3 ≤ M 2 /M 1, - M 1 =10 / A 100, where: - A 100 is the elongation, expressed in %, of the cord under a load of 100 MPa, and - A 100 is the elongation, expressed in %, of the cord under a load of 100 MPa, and - M 2 =[(F 40 -F 30) / (A 40 -A 30)] / S, where: - S is the cross-sectional area, expressed in mm 2, such that S=MI /Mv, where: ▪ Ml is the linear density of the metal filamentary elements, expressed in g per m of cord, ▪ Mv is the mass density of the metal filamentary elements, expressed in g per cm 3, - F 40 is the force, expressed in daN, equal to 40% of the theoretical maximum force F t of the cord, - F 30 is the force, expressed in daN, equal to 30% of the theoretical maximum force F t of the cord, - A 40 is the elongation of the cord, expressed in %, at 40% of the theoretical maximum force F t of the cord, - A 30 is the elongation of the cord, expressed in %, at 30% of the theoretical maximum force F t of the cord, where F t = Ml x Rm /Mv, expressed in daN, where Rm is the mean tensile strength, expressed in MPa, of the metal filamentary elements making up the single layer. - S is the cross-sectional area, expressed in mm 2, such that S=MI /Mv, where: ▪ Ml is the linear density of the metal filamentary elements, expressed in g per m of cord, ▪ Mv is the mass density of the metal filamentary elements, expressed in g per cm 3, ▪ Ml is the linear density of the metal filamentary elements, expressed in g per m of cord, ▪ Mv is the mass density of the metal filamentary elements, expressed in g per cm 3, - F 40 is the force, expressed in daN, equal to 40% of the theoretical maximum force F t of the cord, - F 30 is the force, expressed in daN, equal to 30% of the theoretical maximum force F t of the cord, - A 40 is the elongation of the cord, expressed in %, at 40% of the theoretical maximum force F t of the cord, - A 30 is the elongation of the cord, expressed in %, at 30% of the theoretical maximum force F t of the cord,