A revolutionary underlining experience: dual-tip colored curve pens with special roller points turn complex marks into one easy draw, full of fun. One pen, two tips: roller end for marking lines, 0.4mm fine tip for traditional writing and drawing. A great tool for bujo and planners. 8 colors & 8 line types: vivid assorted colors and smooth curve line types. Fine workmanship makes drawing remarkable curves easy. Safe & high-performance: acid-free, non-toxic ink, no smearing, fading or skipping. Safe for kids, perfect for family use in card making, artwork, coloring, school projects, DIY letters, etc. Well-packaged in a steady storage case with fold-over snap closure, easy to place. Ideal gift for Christmas, birthdays, back to school. Excellent service, responds within 12 hours."