Unique Gradient Colors: 4 Gradient colors gorgeous pen barrel, suitable for using in class, doing some important notes, which is a great gift for office, home, company, students, etc. High Quality Gel Ink Pens: 0.5mm double-ball tip with quick-drying ink, large capacity ink bin, super smooth and delicate, no skips, no smear. Comfortable Soft Grip: The ergonomic grip of the quick dry gel pens is comfortable and non-slip, so you don't feel tired when you use it for a long time, giving you good writing and drawing experience. Smooth & Non-skip Writing: These black gel ink pens come with double-ball nib for smooth writing better, small and delicate, give you no bleed and non-skip writing experience. Retractable Mute Design: Patented silent pressing structure reduces distractions to others especially in quiet places such as libraries and art galleries.