The invention provides a method of twisting the conductors of one or more electrical wires, the method comprising:(a) assembling the conductors into a bundle;(b) inserting the bundle of conductors into a wire twister which comprises an elongate body having an axially extending cavity formed therein, the cavity being open at one end and having a substantially closed cross-section with four sides, at least one of the sides of the cavity being inclined to the axis of the body so that the cavity is tapered inwardly away from the open end, the ratio of the length of the longest side to the length of the shortest side at the axial position at which the conductors, when twisted to form a substantially circular array, contact two opposite sides of the cavity being from about 1.0 to about 3.0; and(c) imparting rotation to the wire twister relative to the conductors, while maintaining the conductors in contact with at least two of the sides of the cavity.