These solidified paint markers should be your number one choice for leaving a lasting impression. Easy to carry, pocket, and writes nearly everywhere. If I was only able to use one marker for the rest of my life I would choose one of these. It marks through oil, grease, rust, mud, snow - inside or outside. It is absolutely permanent. The special "stay fresh" twist-up mechanism keeps paint fresh and ready to use. Available in a variety of colors, including Fluorescent! Made in Japan.