Premium Quality - super squiggles outline markers are Non-Toxic, safe, odorless, acid free, quick-drying, anti-fading and environmentally-friendly. Made with specially formulated, xylene-free opaque ink, and plastic, our outline markers provide nice coverage. Durable nylon tip produces smudge-resistant linesSelf Outline Metallic Markers - Adopted premium pigment ink, AKARUED incredible magi outline marker write in vivid metallic silver surrounded by colored borders, create a beautiful dual-color effect. With 12 vibrant colors, 2mm medium point tip, these Double line pen fluorescent art cool markers add more brilliant whether you're drawing, journalling, writing or highlighting Wide Application - These super squiggles shimmer markers can be used in writing letter, craft supplies, greeting card, poster making, painting and highlighting. They are also great for arts, kids or adults DIY craft projects and more. Suitable for almost any surface, such as rock, metal, ceramic, wood, glass, plastic, stone, etc.. The vivid color and special squiggle pen tip makes it no hassle or mess to clean up, great gift pockets shimmer markers choice for gift. Easy To Use - With cap on, shake the barrel with tip upward to mix the ink before use; then take off the cap and continuous press tip on paper servval times, the double line markers ink will come out. Kindly note use paper with 80gsm above, otherwise bleed through can occur. The double ink pen very suitable for light color cardboard papers to signature