invisible pen colorless fluorescent marking pen uv display marker marking pen key pen

816 Invisible Ink Pen with currency verification and writing function. The writing will disappear within 20 seconds after using this pen, and it can be seen clearly after using the included UV light. The ink dries immediately after writing and the writing disappears immediately. The pen body is printed with decorative paper, and the product has a variety of colors. 1008 cards per piece. Suction card packaging. Exports to all parts of the world, stable quality, low and reasonable price.