Just go to the Ordering page on the tarptent.com website and click on the poles for the tent in which you're interested. The weight and folded length of the poles are fully disclosed there.

There are of course other sources for poles, such as the stout carbon fiber ones from Ruta Locura. They aren't much lighter, but they're stronger.

Because the Rainshadow 2 (a three person tent) is so wide across the front, Tarptent recommends using two poles for better stability. Using the two poles also makes it a lot easier to go in and out--you can slant them outward a bit at the base. Since I go basecamp style when taking out the grandkids, I use the extra poles so I can take my trekking poles with me for dayhikes.