alloy
aluminum
backdrop
background
blank
bolt
bronze
brushed
frame
gray
grey
grunge
hard
heavy
highlight
industrial
industry
iron
line
macro
material
metal
metallic
modern
old
one
pattern
plate
reflection
reflective
screw
sheet
shiny
silver
smooth
square
stainless
steel
strong
surface
template
texture
textured
tile
tough
view
wall