This tube of 1000 ft of the green line is great as mason's line for a strong, tight line or any odd jobs where a superior line is needed. 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. This long wearing, tough, #18 solid green line is easy to see on the jobsite. The nylon line won't mildew, nor be affected by oil or mortar. The nylon material won't absorb water or see the effects of moisture and humidity like other lines. The tight braid can be pulled taut along block and line holders for a straight accurate line. The line is abrasion and alkali resistant and stands up to the abuse of a jobsite from trowels striking it. The line is tested to 170 lb for superior hold. Proudly made in the USA. Kraft Tool Co.® has been an American manufacturer of quality hand tools for the concrete, masonry, asphalt, plaster, drywall, tile, floor covering and leveling trades for over 35 years.