Needles on bar come in various sizes to accommodate different tattooing techniques.

Configurations  include 3,5,7,9 & 11 Round Liner. While shading needles often come in larger sizes such as 23, 25 MAG. Additionally, there are also specialty needle configurations available, such as curved magnums or bugpin needles, which provide artists with more options for achieving specific effects and precision in their artwork. It's important for tattoo artists to have a range of needle sizes to meet the diverse needs of their clients and artistic preferences.

Needles on bar can be used for certain types of Permanent Makeup (PMU) procedures. It's important to note that not all needles are suitable for PMU applications. PMU requires specific needle configurations to achieve precise and controlled pigment implantation. Some needle brands offer specialized PMU needles designed specifically for microblading, eyebrow embroidery, or lip blush procedures. It is crucial for PMU artists to select needles that are specifically designed and labeled for PMU use to ensure safety, accuracy, and optimal results. Consulting with experienced PMU professionals or suppliers can provide further guidance on suitable needle options for PMU applications.

Common configurations include Round Liner (RL), which is used for precise outlining and lining work, and Magnum (M1 or CM) configurations, which are suitable for shading and coloring larger areas. Additionally, there are also specialty configurations available, such as Flat (F), Round Shader (RS), Curved Magnum (CM), and Bugpin, each offering unique characteristics and effects. Tattoo artists often have a range of needle cartridge configurations available to meet the specific needs and artistic preferences of their clients.

TATSoul offers Envy Needles and ENSO Needles. These needles are designed to provide tattoo artists with high-quality, reliable, and consistent performance. TATSoul needles are available in various configurations and sizes to cater to different tattooing techniques and preferences. They are crafted with precision and undergo rigorous quality control processes to ensure optimal performance and safety.

Needles on bar can be paired with various tattoo machines depending on the artist's preference. Most modern tattoo machines, including rotary machines and some coil machines, are compatible with needle cartridges. Rotary machines are particularly popular for use with needle cartridges due to their smooth and consistent operation. 

Choosing between a needle on bar and a cartridge tattoo needle depends on personal preference, tattooing style, and convenience. 

Needle on bar setups offer more flexibility in needle selection, allowing artists to create custom needle configurations by attaching individual needles to a needle bar. This can be advantageous for artists who prefer to hand-build their needle setups or require specific needle combinations for their preferred techniques. 

Sterilized individually packaged cartridge tattoo needles offer convenience and efficiency, as they come pre-assembled and easily attach to compatible tattoo machines. Cartridge needles are ideal for artists seeking a quick and hassle-free needle setup, especially in busy tattooing environments. 

Ultimately, the choice between needle on bar and cartridge tattoo needles depends on the artist's workflow, preference, and the specific requirements of the tattooing process.