Reward Ingame-track?

Okay, so I recently completed the main story. And right after getting the reward after killing Zhaitan, I look to the side of my screen to see multiple items going into my inventory. And two of them were labeled as tracks with a name or something before the word track. I was wondering if anyone could tell me what these are and if someone knows how to access these 'tracks'?

That is for PvP and WvW. The crossed sword and rook icon on the top left of your screen gives you access to them.

The last step of the personal story where you fight Zhaitan used to be the story mode of the Ruined City of Arah dungeon. When they changed it to a 1-5 person story mission they kept the part where completing it unlocks the WvW and PvP reward tracks for the dungeon.