I've found this incredibly useful, especially for tidying electric cables when they're not in use. Simply wind up the cable, wrap enough round to give a firm overlap, then cut. As it's only narrow, it's easy to undo when needed, and is suitable for fine cables such as mp3 player earphones to larger mains cables. As it's cut to length, there's no waste, nor is there a huge bulk of fastener to make it impractical or unsightly. If you've got a drawer or cupboard with lots of things with cables thrown into it (e.g. phone chargers, hairdryers, headphones) and find that it's like unravelling spaghetti when you want to use something, then this is definitely something that will cure the problem. Better than elastic bands (that perish and break) or cable twists (the wire often works it's way out of the end of the twist to pierce fingers, etc) or string (how many times does that supposedly easy-to-undo knot just become permanent so you have to just cut the string?). I thought I'd need more than one roll after I'd been round everything in the house, but I've been pleasantly surprised at just how far it's gone, however, if I do run out, I'll definitely be buying more of the same.