String Material: Mason string line is made of high tensile nylon,tough twisted making it sturdy, resists abrasion,durable and sag-free. Twine String Size: Braided mason's line is 2mm in diameter. Each roll string length is 250 feet /76 meters.No.18 thread size with a breaking strength of 150 pounds. Easy To Use: Release our nylon twine without twisting or knotting, cut out the length as you needed.No worry for visibility, special fluorescent dyes on this twine, go fast to catch your attention. Creativity Endless: You can use our Nylon Mason line for landscaping, laying paving, fencing,craft projects and any DIY works that requires a plumb line etc. After-Sale:Order now, with a peace of mind, RISK FREE.Your purchase is backed by our exclusive 1 Year and 30 Days Money Back.No catches. Need help? Go to [your account] > [your order] > [order problem] > [contact seller]. We're ready to help. Mason Line
Specification
High visibility twine
Line Material: #18 Nylon
Line Length: 250/500 foot
Style: Braided
Contains one or more of: polypropylene, polyester, nylon.
Peferct for masonry jobs and for the layout of general construction. 
It is rot proof, resists oil, gasoline.