Pentel Paint Markers feature permanent, opaque ink that writes well on several surfaces, including paper, metal, glass, plastic, rubber, wood, and cardboard. They are especially well suited for thick cardstock and metal. Use them for crafting, making cards, and decorating a wide variety of household items. These markers come in several vibrant colors and have bullet tips that make lines that are approximately 0.7mm / 1.5mm / 2.5mm wide.