What wheels do I have here?

I just bought a used 2019 Tundra SR5 Crew Max 4WD with off-road package (among others). When I enter the VIN on Toyota's website, the specs include:

18" Wheels w/ P255/70R18 Tires​

The truck I have actually has P275/65R18 tires. They are Michelin LTX A/T2.

Given the following picture, do I have the standard OEM wheels or are these some sort of after market wheels? And do you think they are steel or aluminum? I'm trying to figure out what wheel nut torque I need and the manual shows a big difference between steel and aluminum wheels.

 

Standard OEM TRD off road wheels.

 

Aluminum trd off road rims there.

 

Thanks. I suspected they were aluminum after doing a few tap tests.

Funny thing is that after I posted this question I looked over out the window and 30' away I see another Tundra with the exact same wheels. I don't see the owner around though.

 

Magnet is your friend when in doubt.

 

Doh! Why didn’t I think of that?

 

Aluminum TRD OR wheels. 100 ft-lbs torque.