What is a tipi made from?

Tipi's take a shape of a triangular pyramid. First there are three main poles (sticks). Then four poles (sticks) are attached on to each side, in this case 3 sides. At the top there is a small flap to let smoke get out and finally the three corners are hammered down but not the sides so air can seek in. made out of buffalo skins and other skins as well