abstract
alloy
aluminum
armor
background
brush
closeup
damaged
dark
dirty
durable
frame
gray
grunge
heavy
industrial
industry
iron
layer
line
material
metal
metalic
metalica
metallic
old
plate
platinum
polished
reflection
rough
rustic
rusty
scary
scratches
shabby
sheet
shiny
shred
silver
silvery
steel
surface
technology
texture
textured
vintage
weathered