Each tube of ToolPro's Leveling Jet Line contains 450 feet of highly visible line, making it easy to spot in any lighting conditions. The center-pull design improves handling on-site and helps keep the storage tube intact for repeated use. Ideal for use with lever action grid clamps, the leveling line ensures accurate placement during ceiling installations. A storage pack includes four individual lines, making it easy to keep your layout tools organized and ready for the next job.