The Pentel Floatune Rollerball Pen is a water-based rollerball pen that aims to provide a wonderful floating/writing experience. The pen comes in a streamlined and minimalist design with a snap cap to protect the tip. T he elastic texture of the grip section also makes the pen more comfortable to hold during longer writing sessions. BY108 Water-based Ink 0.8mm Colors available in: Black, Red, and Blue Floatune Rollerball Available in 0.8mm and 1.0mm Floatune Ballpoint Available in 0.3mm , 0.4mm , and 0.5mm