These retractable rolling ball gel ink pens adopt reliable ink which will not easily fade or smudge;They are quick drying, which allow you to use them at ease;With the convenient clip design,you can clip the colored ink pens firmly to your books,notebooks,or bags,which are convenient for you to carry around without worrying about losing them; Besides,the tip will retract automatically when you click the clip, which will not stain your book or pocket.These smooth writing pens are both suitable for kids and adults to use,which are ideal for writing.Customed logo is available.