How can I take my old bearings off my skateboard wheels?

My old set if wheels broke,so I bought new ones, but I want to use the same bearings. Now I can't take the bearings off.

I like to use a hex key (I have one with my skate tool). I put the short end under the bearing, then pry the bearing off. I've never damaged the bearing doing it this way. If your bearings are a little difficult to take out because of dirt, wipe it off as best you can and oil it a bit, then try again.