Sensu is two very useful tools in one. A brush and a stylus for capacitive devices like the iPad and iPhone. The rubber stylus is exposed when the brush is closed. This stylus is great for sketching and writing or as a general navigation tool. Grasp Sensu near the nib section and pull it out of the protective cap. You will reveal the capacitive bristles of the artist brush. Insert the rubber stylus into the cap and the cap becomes a handle for your brush.