-Inch MARSHALLTOWN-Inch TWISTED NYLON MASON-Feet"s LINE Size: #18 x 1000-Feet Core Size: 6-InchMaterial: Nylon Heat-set after winding to stabilize 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..