Pentel Technology: water-based pigment ink and gel ensure beautiful, deep colors. Beautifully opaque writing in metallic colors. Writes even on black paper. Ideal for photo albums, guest books, creative work, etc. Water-resistant ink. Transparent acrylic body. Rubber grip for comfortable writing. Plastic cap with writing color clip.* Visible on dark backgrounds* Line width 0.4mm - Tip width 0.8mm.