These are fingerless mitt, with a simple 5 stitch cable stitch. You could make them longer or shorter by adding or decreasing rows on the ribbing.

The only other materials you will need are a cable needle and yarn needle to weave in the ends.

I found some typos in the original pattern and I have published a revision. I hope this corrects any mistakes and clears up any confusion. Please feel free to PM me with questions or comments.