What difference is there between a 5 or 7 round liner when tattooing?

One has 5 needles whereas the other has 7. 5 Round Liners are the most common lining needle since they make a nice clean line without being too bold. So, the more bold you want the outer outline to be would run in accordance to the overall number of needles in the cluster. Line value is extremely important in tattoos that have a better sense of depth and intricacy, and it is for this reason that a lot of artists will sometimes set up several different machines with different sized lining needles to get a better overall image that pops.