1. The ink is nontoxic and nonirritant! It is confirmed to CE &FDAcertification, it's clear and safe to use on skins!
2. The normal nib size is 1.0(regular type), and 0.5mm(fine type);and other size can be ordered according to client's 
    specific requirement.
3. An inch/metric ruler with each sterile packing.
4. Attention to have a test on patients' skin before large scale using. 
    If the patient is sensitive to the ink(usually gentian violet), pls stop using at once.