Product description: Name: Hanging line level Material: ABS+acrylic Weight: 53 g You will get: 5 x Yellow String Level 1 x Red String Level Premium quality: Bubble String Leveler is made of high-quality mirror acrylic and ABS, crystal-like and transparent, and the horizontal direction is clear at a glance. It's obvious: you can score quickly the horizontal position by snapping a line, or you can place it on the edge of the object in several combinations to determine if the object is already level. Ingenious design: V-shaped groove in the base which provides reliable footing when leveling round objects such as pipes, ducts and trees. Convenient and quick: 2.9 inch long level has open hooks durable to glide on a line. Allows you to level and lay out twine and can be used on chalk reels to lay out a level line. Wide range of applications: used for leveling measurements in the building trades , landscaping, fencing and hanging pictures, laying bricks, pipes, drains and tiles.