Needles

When should I use a 5rl and a 7rl...the same size for shaders

tbh each tattoo will call for a different set of needles , i cant really say anything elce here other than if you want a thin line you would use a 3rl and the thicker the line-weight the bigger the grouping in the needle , this is pretty basic stuff that you should be able to figure out on your own but saying that its always better to ask if you aren't sure.

Stephen.