Very strong extension. It doesn't have much memory, but I also use it outside, and it's very cold now, so it hasn't had time to warm up yet. Good value for money. Fits on a cable spool with an extra washer, it works really well. See photos. There are two types of spools, one that you hold and one that has a handle - both are great for holding this line, but the handle isn't as versatile. To use the cord you really have to take it completely off the spool, unless you wind it from the center out,