ya when i first started tattooing i was using a 9 liner for every thing cause my line work was not where i wanted it to be yet and so the 9 helped make my line work look better. now adays i mainly use a tight 5 for every thing and if i want thicker i will build them up with that and smaller stuff i use a 3 but i use 3s like once a month maybe. looking forward to the ttech grips and niddles cause i can try out diffrent needles with my neo tat.