This guy line set is perfect for firmly building your Zerto I, Twelto II, Zerto II Long, and Pico Shelters.Adjustable length and loop for immediate field use■ Very low stretching, so you can set it up with firm tension.■ It is resistant to water and has excellent weather resistance, so you can rest assured even in harsh fields. ■ The phosphorescent type is free to stick to guy lines even at night. ■ The 2mm diameter guy line has high breaking strength, making it ultra lightweight and compact.