Chris made these wooden arrows for an episode of Murdoch Mysteries. He notched the ends, making them self-nocking. He made other ones that had plastic nocks on them like most of us use which made sense to me because I bet it'd be really frustrating to get your arrow all shaped and then blow it by splitting it when you carve a nock into it. And that, Chris pointed out, is why you see a little string tied on there. It holds the wood firm so cracks don't wiggle their way down.
A while back when I wrote about drawing arrows (with-a-pen drawing) I couldn't have told you why they always showed them with a string around the end. Now that I realize my incuriosity, I suppose I should wonder why they have stripes painted on them, as well. Ignominiously, I turn to a search engine, which reveals that it's called cresting. I know: doesn't look like a crest, right? Well, think about a crest as an identifier of your house. The crests on my arrows would communicate, "Property of the House of Vaughan." Which would be a nuisance to actually write on them and wouldn't look as cool.