#18 x 500’ Bonded/Braided Pure Nylon Mason’s Line Seine Twine-White/Black (Salt/Pepper)-MADE in USA. 180 lbs. Tensile Strength, High Abrasive Resistance, Will Not Rot or Mildew, Resists Most Chemicals, Hold Knots, Built-In Elasticity, Does Not "Fray" when struck by trowels or other tools. Size #18. Size 8 oz.