The Types segment classifies Artificial Discs by material composition and design architecture, primarily into metal‑on‑metal, metal‑on‑polyethylene, ceramic‑on‑ceramic, and polymer‑based devices. Metal‑on‑metal systems, often titanium or cobalt‑chrome alloys, capture roughly 40 % of the market due to their proven durability and long‑term wear data, especially in lumbar applications. Metal‑on‑polyethylene constructs hold about 35 % share, favored for their lower modulus mismatch and cost‑effectiveness, making them prevalent in both lumbar and cervical procedures. Ceramic‑on‑ceramic discs, representing near 15 % of sales, are positioned for high‑performance niches where biocompatibility and radiolucency are critical, though limited by higher manufacturing costs. Polymer‑based (e.g., PEEK or silicone) devices account for the remaining 10 %, primarily used in experimental or pediatric contexts. This material‑based taxonomy clarifies how each type contributes to the total market, influencing pricing dynamics, adoption rates, and innovation pipelines within the Artificial Discs sector.