BIC Intensity Permanent Markers help you add bold color to your crafts doodles labels adult coloring projects and other projects. These ACMI-approved and non-toxic permanent markers feature low-odor acid-free inks* that create long-lasting color on just about any surface including glass metal photos foils coated paper plastic and even oily and damp surfaces. The snap cap feature uses a vapor seal locking system to prevent dry out and a soft non-slip grip offers comfort and control as you create.foreign parts each fine point marker has vibrant fade-resistant ink that will help your marks stand out!