Core made from 72 strands of flexible galvanised steel wire with an outer covering of plaited jute, giving an outer circumference of 3.175 cm. Breaking strain of not less than 1 ton (1016 kg). A non ferrous brass swivel shackle has a breaking strain of 1200 kg. The lifelines are available in varying lengths from 22 metres to 61 metres as standard. Other lengths can be made up to order as required.