What joint system do toy story action figures use?

The provided evidence about the Toy Story franchise and its characters, such as Buzz Lightyear, does not include any description of the mechanical joint system used in the action figures. No details are given regarding ball‑and‑socket joints, hinge mechanisms, or other articulation methods. Therefore, based solely on the available information, the joint system remains unspecified. For a definitive answer, additional reliable sources that discuss the manufacturing or design of the Toy Story action figures would be required.