I've ordered several other similar ones from MITB, but these ones are definitely the best; they produce really good sparks. Highly recommended.
It's really difficult to catch the sparks on a picture, so I did a video. See here: http://youtu.be/5gIVWIksKKo where you can see the sparks it made (kinda).
In summary, great product, great price, fast free delivery. Thanks MITB!