Faithfull Braided Nylon Chalk Line for use with powdered chalk for marking between two points to give a straight line. Braided line resists fraying, and is also useful for a plumb line as it does not spin round as conventional twisted cord. Braided nylon has less stretch than other lines and is also the strongest.Braided line resists fraying and is also useful for a plumb line as it does not spin round as a conventional twisted cord. Braided nylon has less stretch than other lines and is also the strongest. 100 metre spool.