4 Different Sizes--You will get 5 pieces empty graffiti markers in 4 sizes, The nib sizes are respectively 10mm, 16mm, 30.5mm and 50mm, it is enough to meet your different painting demands, offering you a lot of convenience.Premium Material--The empty graffiti markers set is made of high quality plastic with skillful workmanship, sturdy and firm, which will not break or deform easily.Transparent Desgin--The transparent tube is conventient for you to control the amount of ink. And the glass ball inside the pen can prevent liquids from solidifying for smoother drawing and writingEasy to Use--You just need to remove the nib area of the pen and fill the paint or ink into it, then screw the nib back to begin writing and drawing.Wide Applications--It can be used to graffiti on most flat surfaces, included wooden boards, plastic boards, canvas, clothing, shoes, walls or other items and place. It can develop your imagination and enhance your hands on ability.