This article talks about the Kongoh Gumi Braid and the difference between "Z" and "S".

You will "order" this item like any other item except it will come as an Instant Download.. After you go through the ordering process, you will receive a confirmation email. Later (within minutes, usually) you will receive a second email that says "Your Downloads Are Ready". Click each link, press "Download" and you'll get your Downloadable Tip. Sometimes, the downloads go to a "downloads" folder on your computer so make sure you check there if they don't open on your screen.