All aluminum. Display base and shaft optional. Two versions, 1.5"/38mm (screen accurate size ) and 2"/50mm (car shifter size.) Both sizes have M16x1.5 threading.
The ball is removable from the optional shaft/ reversible display base, and it unscrews just like seen in the show. It's made from solid aluminum, with a static button top that is anodized blue. Unscrew it and give it to your favorite three-fingered child ;)
The display base is about 3" in diameter and made of solid aluminum like the other parts. It has an anodized black coating, with the mudhorn clan of two crest engraved into the surface. The base is reversible, so you can flip it over if you prefer to display the knob with the crest hidden underneath. It stands about 5" tall.
38mm ball weighs 70 grams
50mm ball weighs 160 grams
The 50mm car shifter knob version is available as ball only. Internal threading of both sizes of the ball is M16x1.5, so you'll likely need an adapter old elsewhere. Look up your car thread size, and find the appropriate adapter. Companies like https://www.speeddawg.com/standard-thread-shift-knob-adapter-kit-6-sizes/ offer adapter packs, but you might be able to save a few dollars if you order just what you need.
V2 knobs are what is pictured, and as of late December 2020, I've switched from V1 to V2. Only V2s are available from now on. Changes from v1 include the new thread pattern, slightly wider blue button, and less deep equator trench. Blue coloring is now added for you on V2 which was not included in V1. Both sizes of V2 have the internal threading of M16 x 1.5 so they both can accept an adapter to be fitted to a car shifter.