Cage is all metal including the shelves and ramp even thought information said that shelves and ramps were plastic.  I did prefer this to plastic parts as this was for a pair of rats. I had no problem with instructions on assembly even though others said they had problems.  cage went together well within approx. 30 min. seems very sturdy and lots of room.  Wish platforms were a little bigger and ramps are a little loose.  Price was extremely reasonable versus other similar cages.  Easy to clean. Would buy again if I ever need a second cage.    Hope this is helpfull for anyone needing similar cage.