"Ballpoint Pen" Gel Pen with Mascot, Monchhichi Ballpoint Pen, iPlanning, Heart, Gel Pen with Cute Rubber Mascot. Another adorable new item has arrived in the globally popular Monchhichi merchandise collection! This black gel pen has a light and pleasant 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). Perfect for study/writing implements/stationery/school supplies.