aluminum
backdrop
background
black
blank
brushed
candid
circle
closeup
decay
design
dirty
dots
flat
floor
grain
gray
grip
grunge
hard
heavy
industrial
industry
iron
ironworks
light
lines
mark
material
metal
metallic
pattern
plate
polished
reflect
rough
scratch
sheet
shiny
sign
silver
spot
stainless
steel
strong
surface
texture
textured
tight
tough