Braided Nylon chalk lines are ideal for most applications in the building industry. This Braided nylon line is particularly suitable for bricklaying as it is stretch resistant. Length: 18M Box of 12 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. Faithfull A01 B1054