stainless steel. I'm sure it's polished/smoothed in some way, but since it's indoors, it wouldn't have to be treated too much.
Hope that helps!
Stairs to the left of front door
Industrial, unfinished steel stair spine (double spine)
open stairs done in white wood
out door stairs idea
metal stair not-rails
Kitchen + Stairs +Floor
stairs are cool with beams
Open staircase, don't like steel
open stairs...cool stairs...Stair case...Suspended Stairs...Stair and floor...Stair cases...wood stairs