Needle Taper: American Standard premium tattoo needles are comes with long taper for the round liners. A long taper allows for smoother needle penetration and better ink flow, which is important when creating clean, precise lines with a round liner needle. " Needle Size: Round liner needles are typically available in a range of sizes, ranging from very small (such as a 3RL or 5RL) to larger sizes (such as a 14RL or 18RL). The choice of needle size will depend on the specific task at hand and the desired result. Smaller needles are typically used for fine lines and detail work, while larger needles are better suited for bolder, more dramatic lines. Needle Configuration: Our Round Liner Tattoo Needles are in single needle configuration which refers to a needle that is composed of a single needle tip, which is attached to the needle bar. This configuration is often used for creating fine, precise lines and intricate details in tattoos. Sterilization: EO gas sterilization which very effective in killing a wide range of microorganisms, including bacteria, viruses, and spores. Our Tattoo Needles are EO Sterilized which is a commonly used method of sterilizing medical equipment, including tattoo needles. It involves exposing the equipment to ethylene oxide gas, which is a highly effective sterilizing agent. Quality: Our tattoo needles are made of medical-grade stainless steel 316. This type of steel is strong, durable, and resistant to corrosion, making it an ideal material for tattoo needles. Compatibility: These tattoo Needles works well with all kind Of tattoo coil and rotary machines.It's Standard Size and design make it more compatible with your tattoo machine.