Tattoo needles are specialized tools used in the tattooing process to inject ink into the skin. They come in various configurations, including single needles for fine lines and multiple needles grouped together for shading and coloring. The type of needle used can significantly affect the final appearance of the tattoo. These needles are typically made of stainless steel and are designed for single-use to ensure hygiene and prevent infections. Tattoo artists select specific needle types based on the desired effect, such as lining, shading, or color packing. Proper needle selection is crucial for achieving clean and precise tattoos.