Dread decorations question

What is this type of thing called? When you weave in yarn/thread? I am really wanting to do this when my dreads get longer and more abundant and just have one dread with rasta colors. Thanks!

updated by @gavin-brooks: 01/13/15 09:13:44PM

wouldnt wrap in wool yarn use wembroiderty thread or hemp and they are called hair wraps

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