The special braiding process creates extra elasticity which helps eliminate any sagging in this line making it perfect for laying out even rows of block and brick. The nylon line won't mildew or see the effects of moisture and humidity like other lines. The strong, tough orange line is braided with a black fleck braid of distinction making it easy to spot in your toolbox. The tight braid can be pulled taut along block and line holders for a straight accurate line. The line then goes through a special bonding process which adds extra abrasion and alkali resistance. The bonded line is better at securely holding knots. The line stands up to the abuse of a job site from trowels striking it. The line is tested to 170 lbs. for superior hold.