Heavy Duty Downhill / Jump Rims - any ideas?

[Fatmat]

Hi. I’m trying to identify these rims, Specialized hub on rear, Shimano on the front - the front is definitely new, the Specialized rear may also be a replacement? They’re extremely heavy duty, there are zero indications / logos / branding, does anyone recognise them or suggest what to search for? Thanks

 

[benjabbi]

Could be Alex?
Look a bit like a 26" version of some of their early 2000s BMX rims, weigh a ton and literally bomb proof.

 

[trailstar82]

Looks like a sun mammoth with the black vinyl removed.

 

[jimo746]

Non-eyeletted, that discounts the Sun Mammoth rims I think in fact any decent rim would probably have eyelets around the spoke holes.