what are hub stacks on yo-yos for?

i was wondering why people put hub stacks on yo-yos.  any hub stacks, the big flat ones, or the little ones, just hub stacks in general.  thanks in advance! :D 

yokozuna6 years ago
It allows you to spin the base in your hand, and thus do certain tricks that are not possible on yo-yos that don't have hubstacks. More information here.
salomon1996 (author)  yokozuna6 years ago
ok, could you give me some examples of the tricks one would do with them?
salomon1996 (author)  yokozuna6 years ago
cool, thanks! :D