An anti-vibration extruded sheathing (4) for cables (2) such as deep water mooring lines, mast stays and bridge cables, an extrusion method and extrusion apparatus comprising a rotatable die (35) for providing such sheathing (4) with at least one integral helical strake (5) are disclosed. The width of the strake (5) can be adjusted from a maximal width to a minimal width during the extrusion process, wherein the minimal width is adjustable to 0. By this means, a strake (5) with interruptions in the longitudinal direction of the cable can be produced in an efficient manner.
Also a method and an apparatus for providing the sheathing with indicia using a laser marking unit (20) is disclosed.