I call this one the infinity twist. It is a hollow cone with holes in it, bent around itself so the tip goes back into the base. Then after 2 full spins around, the tip comes back out of a hole and connects back to itself to repeat the pattern going outward. Then I broke the base end on each side into 3 strips and connected them, 2 on the sides and one goes strait through the center and wraps around the tip, which connects at the same point. So its basically the infinity sign, but with one extra spin. All ends are connected and its one long tube wrapped inside itself.
I hope that makes sense, not sure how else to describe it. Contact me if your interested in a material not listed.