For light shading and portraits use 7-11 needles.
Hereof, what are round shader needles used for?
RS or round shader are used for shading. Flats are used for areas with geometric shapes and shading. Weaved magnums are used for shading, blending and coloring large areas.
Keeping this in view, what are M1 tattoo needles used for?
M1 = Magnums are typically used for filling large spaces, blending and shading. M1C = Curved Magnums are gentler on the skin, so they can be better for filling, blending and shading in delicate areas.