KingCord Twisted Polypropylene Mason's Line is most often used to create a straight, level line as a guide for laying a course of bricks or setting a line of fence posts. Mason's line is strung tightly between two fixed points, ensuring there is no sag, which greatly reduces the need to use a level once properly set. KingCord Mason's line comes in white and several high visibility colors, so it can easily be seen against the visual clutter of a line of bricks. Beyond laying bricks, mason's line is a great all-around utility twine that packs good strength into a small diameter. It's great as a mason's line or chalk line, but works equally well for other home improvement projects, landscaping, crafting or even for kites.