Or 6 cubes with 24 connectors. There are also some "Bonus" boxes that have 2 additional grids, they call them dividers or shelves and they come with the clips to hold them up. We are now finally redoing our piggy cage, and we bought 3 boxes for our 4 story cage. They are originally $19.99, so I was quite happy with a $15 savings, and thought I'd pass on the info