EZ Line is a one of a kind elastic polymer with 700% stretch. EZ Line is unbeatable for simulating telephone and electric lines, all suspended wires, ropes, fences, etc. The elastic polymer will stretch when bumped and instantly go back to its original shape. When we look up outside, power lines appear to be dark colored, so you would think black would be a good color for your layout, but when you look down (as we do on our layout), black just disappears. I talked to the owner at Berkshire Junction, and they recommended that most layouts look good with either the white or the green, as the dark colors are just not visible. The line is sold on 100 foot spools and is .010" (0.25 mm) diameter, which is recommended for N and HO scales.This size works well for other models from 1/350 1/87 scale. EZ Line is also good for barbed wire fences, guard rails, tie down straps, airplane antennas and rigging for biplanes, and ship rigging. We carry all colors and in both fine and heavy diameter. The fine and heavy diameters are shown together in one picture for comparison.