There are several brushes to a box. They are also pretty simple to clean. You just wipe them on paper or a tissue till no color comes off the brush. (the tip will remain colored but it will not come off)
I usually have several brushes going at the same time. I'll use one for my pinks and reds, one for my blues and purples, one for my browns, blacks and grays, and one for my yellows and oranges.
After SEVERAL uses I finally throw them away.
They just work so much better when trying to get into small areas and trying to shade details. Cotton swabs loose there shape quickly and are too big for alot of the jobs and even the smallest of pom poms don't make it into the tight corners.
Michelle