Fangrui Product Details [durable]: Each Linear Color Pen Has A Soft Grip And A 0.4mm Durable Tip. Premium Materials Make Our Pen Glide Smoother Than Others. Create A Variety Of Elegant Marker Lines In A Simple And Fun Way With Just One Touch. [double-pointed]: The Double-pointed Marker Design Is Used To Draw The Roller End Of The Marker Line. The Curve Highlighter Set Combines Highlighters To Mark A Variety Of Colors And Is A Great Tool For Your Studies And Artistic Work. [safe And Practical]: The Acid-free And Non-toxic Ink Of The Color Curve Marker Will Not Smudge, Fade Or Leak. Many Well-designed Curve Line Types. His Unique Nib Can Highlight Some Important Parts Well And Draw Some Beautiful Patterns, Which Is Practical And Necessary In Study And Daily Life. [quick-drying And Smooth]: Childrens Color Curve Pen, Full-speed Drying Ink, Dry Fast, Clear And Smooth Writing. All You Need To Do Is Place The Pen Under The Text You Want To Mark And Slide The Smilevol Pen Lightly. [wide Applications]: This Kids Color Curve Highlighter