Material: Use high quality stainless steel, needles are sharp and elastic for quick piercing, Painless to make a beautiful eyebrow line. Apply to: This makeup tattoo needling suit for Charme Princesse EM40 series permanentmachine makeup . Safety: E.O Gas Sterilized. single-use design to makes sure avoid infection. Easy to Use: The permanent needle easy to use and suitable for beginner, apprentice or the confirmed tattoo artists looking. Notice: For the Machines with 10mm needle port(Kindly check ur pen diamater before purchse)