There are 24 large pockets on each of the wide side, 26 large/small pockets on each of the narrow side.
The frame adopts 2*2cm square tubes, which is very strong.
The wire diameter of pockets is 4.5mm, which can hold even heavy books. Moreover, the inclination angle of them is precisely designed, and the wide and narrow sides can be perfectly fitted, which is convenient for storage and transportation.