What is this part of the truck called?

What is this part of the truck called? It don't feel like metal, it's it plastic/composite?

 

bed sides
and yes, they're metal with plastic flairs

 

Do you mean the bedside? or the attached fender flare? Bedsides are metal, flares are some plastic material.

 

ABS, same as the grille.

 

Wasn't sure if there was a technical name for them. I was looking at mine today, and thought they were some type of plastic. I know the flares are some type of plastic, but the bed sides seemed kind of plasticy too.

 

Bedsides are definitely metal. I went through several metal cutting discs to cut mine up.

 

Definitely steel.

There are fiberglass replacement bedsides available but judging by your avatar you have stock bedsides.

 

^^^cool thanks! Yes, my truck is completely stock. They definetly didn't feel like metal to me, glad I was wrong!