Naming "Breathing Pen", it seems that it really has life ~ You listen to it ~ 'Poof Qi ~ Poof Qi ~ '.
The starting point of the concept design is: the penholders of pens on the market have different thicknesses, and people can only unconditionally accept pens with different thicknesses. From an ergonomic point of view, people of different ages [primary school students/middle school students/college students, adults] should have different penholder thicknesses. So I conceived this pen that can adjust the thickness of the penholder at will. In addition to satisfying hands of different sizes comfortably, it also adds a little bit of fun.
Operating steps: First loosen the end of the pen and squeeze it to allow air to enter the main body, repeat this operation until the thickness of the pen is suitable for the grip, and then tighten the end of the pen to fix the internal air.