-Inch MARSHALLTOWN-Inch TWISTED NYLON MASON-Feet"s LINE Size: #18 x 1000-Feet Applications: Great for staking out sites, concrete and landscape layout and brick and block laying Core Size: 6-Inch Material: Nylon Type: Twisted Heat-set after winding to stabilize Color: White Not affected by mortar, oil, or mildew and will not absorb water Great for staking out sites, concrete and landscape layout and brick and block laying Inner and outer pack quantities are shown in table Made in U.S.A..