What is this for?

[Giuga10]

I recently bought a complete fly fishing set which included a completely set up fly rod and it also included a package with some fly's and two pieces of knotted red thread which I have no idea what to do with.

Here's the pic's:

In the package.....


Both of them on a table.....


On the carpet.....


2nd picture on the carpet.....


Sorry for the numerous pics

I was thinking they would be used for fly tying. I have tied a couple of flies myself but none which have involved thread like that. I was thinking maybe for a streamer or something along those lines but I'm not sure.

Any help would be great,
Thanks,
Giuga10