"Ballpoint Pen" Gel Pen with Mascot, Monchhichi Ballpoint Pen, iPlanning Balloon, Gel Pen with Cute Rubber Mascot. Another adorable new item has arrived in the globally popular Monchhichi merchandise collection: this black gel pen with a light writing feel. The pen barrel design and rubber mascot are adorable. There are many cute stationery items to choose from, so be sure to find one you like. Size: Diameter: Approx. 12 x 150 mm (Pen). Writing Instruments/School/Study/Stationary.