Let's start with the Peruvian spindles. The two on the right were purchased from Abby Franquemont, who got them in the market in Cusco, and the one with fiber on it came from Cochabamba, I believe. They are the typical spindles, with friction-fit low whorls, used by Andean women to spin wool and camelid fibers. The smaller one would be used for spinning singles, and the larger for plying. I spin singles with all of them.
Given my focus on authentic textile traditions, I like to spin wool for backstrap weaving with these spindles, in the manner of Andean spinners. There's excellent cultural and technical information in a video with Nilda Callañaupa Alvarez, which helped me understand more about the typical way of using these spindles.
I love these spindles because they are simple, straightforward, and functional - and the weavers of the Andes prove that incredible work can be done with them. As for me, it takes me a while to fill them up, and the quality of the yarn is yet to be tested.