Premium & Unique Shimmer Markers: outline metallic pen set has 12/24 assorted bright colors. The double line outline pens designed with unique technology will automatically produces outlines for you to create a beautiful dual-color effect. And it can draw 3 different effects on light colored paper, black paper and smooth surface. Let's DIY unique dual-color art projects today.Non-Toxic & Safety: These 2-3mm medium tip glitter markers are water-based, non-toxic, odorless, smooth flow, quick-drying, high quality certificated ink and safe for kids, girls and teens. Environmental friendly and conforms to ASTM D-4236 & EN71-3 certificate. (We suggest children under 3 years old should be used under the supervision of an adult).Wide Use: These sparkly outline pens can be used on almost any surface, such as rocks, wood, canvas, fabric, glass, plastic, metal, etc. It's perfect for Cristmas cards, birthday card, greeting cards, envelopes, gift tags, sign, easter eggs, christmas ornaments, scrapbook, poster. Great gift idea for Christmas, Birthday, Mother's Day, Easter Day, Valentine's Day, Thanksgiving, New Year. Both beginners and professionals can better release your creativityEasy To Use: These self outline markers is very easy to use. Firstly, shake the supersquiggles pen up and down with cap closed to well mix the ink. Secondly, press the tip down for a while on paper until the ink flows to the tip. For best results, please re-cap the razzle dazzler markers immediately after use and store horizontally. Contours are better on thick paper above 80gsm and light colored paper.