... .Use for marker, watercolor pens, whiteboard pens, etc 3.Fibre material ink reservoir 1) Use for Permanent Marker Highlighter Marker White ... of marker, highlighter, watercolor pens, whiteboard pens, etc. 3)Inner material is DTY (Draw Textured Yarn), while polypropylene is the outer ... , it has a good absorption of ink. high quality fibre filter