abstract
alloy
aluminium
aluminum
art
backdrop
background
blank
brushed
chrome
clean
closeup
design
dirty
durable
empty
glossy
gray
grunge
grungy
hard
heavy
industrial
industry
iron
material
metal
metallic
old
pattern
plate
polish
polished
retro
rough
scratch
sheet
shiny
silver
smooth
stain
stainless
steel
surface
technology
texture
tough
vintage
weathered