The way they or packed in the box with the mounting parts pact so tight in the center of the center of the roll made the hard to remove, and the zip ties were bent so sharp that two of them broke into when i unfolded them. The opening way to large for 3 and 4 inch down spouts, i'm sure that's to make them more universal, but it makes it very hard to wrap all that material around the spout, and hold it all together while you install the zip tie. They seem to be well built however,the spring is very stiff, we haven't had any as yet, so i'm unsure how they are going to unfold, but i'm thinking, it may take a Biblical rain to fold them out,we'll see?