Aluminum DH/Enduro rims, robust yet lightweight (weighed at less than 1800g for the pair with valves).
They have only been used for enduro (~5000km in total) and show signs of use (see photos) but are still airtight when set up tubeless.
The bearings have no play.

Specifications:
Shimano HG freehub (11-speed)
For front axle: 15x100mm and rear axle 12x142mm (Non-Boost)
Internal width: 28mm front and 25mm rear
For 6-bolt brake discs