Pilot Acroball Pen - 0.5mm combines the vibrancy of gel ink and the quick-drying and water-resistant properties of conventional ballpoint ink. Therefore, the result is vivid, long-lasting lines when you write and draw. The ball at the pen tip rotates smoothly, creating a gliding, no-skip writing experience. The rubber grip also gives you writing comfort, featuring a tire tread-like texture to give you a firm hold.