Features: A string level checks the vertical and horizontal position of the Bows for installing nocks and sight. Make of impact resistant ABS materials, high sensitivity bubble and easy to use. Very accurate bubble level to determine the position of the Arrows nocks and keep the Arrows level. Easy to use: Put the Arrows on the stand, hook the Arrows to the string, and move the Arrows up / down until it's level. It is easy to operate, adjust the position of Bows, Arrows, and so on, improve the accuracy of shootings, and is essential good helper for beginner, professional archer and enthusiasts. Specifications: Materials: ABS Part 1 Size: about 35x68mm/1.38x2.68inch Part 2 Size: about 30x70mm/1.18x2.76inch Package Includes: 1set Bows Tuning And Mounting String Level note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.