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