Easily create fantastic pictures and amazing airbrush effects with the 10 pack of blo pens desk displayr the blo pens desk display includes 10 blo pens with a handy desk stand also included in a bonus stencil to get you started just put the stencil on a sheet of paper blow through the pen and see your picture appear r blo pens caps are washable and interchangeable they are completely safe for children to use with non toxic ink