Usage Quotas of Projets

Hi everyone! There is a point that I cannot understand about usage quotas. I want to use GitLab Container Registry but I cannot understand what it costs exactly. Is the only cost of using GitLab Container Registry storage usage ? I know that I have 10GB per a project so if I exceed 10GB because of the images that I have in Container Registry, I have to pay extra. However, what about data transferring ? The images that I’m gonna use will be used by my CI jobs. In this case, does data transferring count ? Because the transfers will be only in GitLab. Thanks !