Flat Premade Tattoo Needles - High Quality Premade Flat tattoo needles. All of our Flat Premade Tattoo Needles are made with #12 0.35mm stainless steel needles with standard taper (1.4mm-1.5mm) Flat needles are primarily used to achieve tonal gradations in tattooing. Flat Configurations are generally 3-9 needles soldered side-by-side with no spacing.