What's this?
concrete
What's this?
nylon
What's this?
steel
What's this?
denim
What's this?
aluminium
What's this?
bamboo
What's this?
iron
What's this?
stone/rock
What's this?
cotton
What's this?
leather
What's this?
sand
What's this?
rubber
What's this?
brick
What's this?
foam
What's this?
polystyrene
What's this?
cardboard