Pen length: about 13.5 cm/5.31 inches Use on paper whose thickness exceeds 80 grams to ink penetration. Widely used in: rock painting and black paper, gift card making and scrapbooking, fabric and metal with ceramics and wine glasses, Christmas cards. Comes with 8 bright colors containing shimmering ink to increase shimmering luster. Using these permanently marked bright, highly visible metal surfaces, bright and dark surfaces can be easily marked. Suitable for use by people of all ages. It has the characteristics of ultra-fine nib, quick-drying and tasteless. Children under 3 years old should be used under the supervision of an adult. The double-line mark is set in 8 bright colors, and the unique technology can produce strip outlines to create beautiful and bright two-color effects for you. Ink: water-based 1 set of 8-color double line markers It is recommended to cover the lid and store it horizontally after use. Close the lid and shake the marker well to mix the ink. the cap and gently press down on the nib on the surface several times to the ink until the ink starts to flow. Pen case material: plastic Very suitable for arts, crafts, coloring, gift cards, Christmas cards, DIY craft projects, painting, etc. Use writing paper to write on thin paper to ink from oozing out. Contains . Not suitable for children under 3 years old. Pen Length: About 13.5 Cm/5.31 Inches Very Suitable For Arts, Crafts, Coloring, Gift Cards, Christmas Cards, DIY Craft Projects, Painting, Etc. Use Writing Paper To Write On Thin Paper To Ink From Oozing Out. Use On Paper Whose Thickness Exceeds 80 Grams To Ink Penetration. Contains . Not Suitable For Children Under 3 Years Old.