getting a Robo dwarf hamster how big a cage?

  i just got a new from my friend who won it in a hamster race and my old starter cage has nothing in it its not cracked and its length is 14 and a half wide 8 and a half and tall 14 how many robo hamsters can i put in it i put 2 wheels in it for my 1 hamster if i get 2 will they fight? is it to small? how many can i fit?
Well if 2 are from the same place then the will into fight but if there from different places the will kill each other litteraly KILL eachother. Put a wheel in the cage deffinetly some cardboard or storebought tubes. I made a homemade hamster hammok. mabye put a couple Robo hamsters make sure they are all in the smae cage when you get them. A water bottle is very important.
what do u mean about robo dwarF hamster and yeah why not but make sure there both female or male
if you are older then 10 dont get a hamster unless your breeding them because their boring as hell