1COLOR CHANGE RESISTANT: Curve pens uses waterproof, non toxic ink that is resistant to discoloration and will not penetrate most papers without spotting. 2PROVIDE COMFORTABLE WRITING: Curve pens highlighters marker provides a fluent and easy writing experience. Soft and ergonomic grip for comfortable writing. 3ULTRA FINE TIPS: Curve pens set features an ultra fine tip with a metallic coating for excellent performance in all areas of writing, drawing, and coloring with easy and convenient writing. 4RICH COLORS: Curve highlighter pen set is full of rich, vibrant and timeless colors. With an ample supply of ink, don't worry about running out of ink too often. 5RANGE OF APPLICATIONS: Colored curve pens are perfect for professionals and artists alike. Perfect for home, office, work, business, co workers, church, clubs and organizational events.