The Atwood Micro Cord is a great thin string that has a 100 pound (45 kg) breaking strength, making it great for lightweight work where your regular 550 paracord or even the 275 paracord would be an overkill. It is great for thinner strand bracelets, lanyards and can be improvised as fishing lines or something to wrap around a handle.
It comes in a reusable spool making this a great utility string. This durable string is resistant to rot, UV and its colour does not run.