All drawing tablets have multiple components, but the primary component is the EMR sensor - which also called the digitizer.
And despite all the many brands of drawing tablets you see, there are only a couple of manufacturers of digitizers. These are: Wacom, Hanvon Ugee, Huion.
Wacom digitizers are used in their own products.
Hanvon Ugee supplies digitizers to Xencelabs and XP-pen tablets
Huion supplies supplies digitizers for: Gaomon, Huion, Veikk tablets. And Huion supplies digitizers for Artisul tablets through their acquisition of UCLogic.
Huion acquired UCLogic in 2019 (https://ja.wikipedia.org/wiki/UC-Logic_Technology_Corp.)