Metallic cord and pneumatic tyre

A steel cord characterised by a zigzag filament which is zigzagged two dimensionally or in a plane by a zigzag pitch length (Pw) and a zigzag wave height (h) and made up of straight segments each extending between zigzag peak points, each of the zigzag pitch lengths (Pw) and zigzag wave heights (h) being constant along the longitudinal direction thereof and either a second zigzag filament of the same type but having a different pitch length (Pw) or a straight filament such that the cord has an open construction so that rubber can penetrate it. [0002] The cord may be a single bunch or a twisting together of two or more bunches each comprising zigzag filaments. The cord may have zigzag filaments of at least two different zigzag pitch lengths. [0003] In each of these constructions the result is to give an open cord construction and the invention also includes a tyre incorporating such cord in the carcass breaker or the like.