Easy To Squeezelcontrol The Ink Or Water Flow With Just A Squeeze Of The Tube（note Please Make The Water Less Than 2/3 Of The Pen's Volume When Filling Water Into The Pen） Easy To Cleanjust Using Water To Clean After Used Durable Nylon Brush Tipwould Not Stray Or Spread While Painting Great For Solid Colors Or Powdered Pigment Use With Aquash Watercolor Crayons Markers And Pencils To Spread And Smooth Colors 6 Tip Sizes Set Of 3 Point Tip Brush Pens And Set Of 3 Flat Tip Brush Pens(small Medium Large)