Born to Accomplish Curve Lines: Having trouble with drawing wavy lines using normal colored pens? Try this specially made roller marker - able to create various elegant mark lines with one single pull, none of the trouble, all of the fun High-Quality Material: Both tips of these fine tip pens use water-based ink. Quick-dry, paper-tight, lint-free, write smooth, skip-free lines, bold, and consistent underlining, while 100% safe to the human body Convenient and Simple: You only need to place the pen under the text you need to mark and slide it gently. The operation is convenient and simple, and the ink is also quick-drying. Wide Applicable Occasions: You can use the fine points of the journal pens to write diaries, letters, cards, make notes, scrapbooks, and so on, while the other distinctive tips are nice for underlining some important parts and drawing some beautiful patterns. Ideal Gifts to Kids: The Curve Pens and Highlighters Set is a perfect gift for both boys and girls, ideal for DIY crafting and daily learning, bringing joy and fun to kids during their learning and DIY making. style:6 color single head / 8 color double head package: 1set