"Ballpoint Pen" Gel Pen with Monchhichi Mascot, Pose, iPlanning. This gel pen features a cute rubber mascot. Another adorable new item has arrived in the globally popular Monchhichi merchandise collection. This black gel pen has a light, comfortable 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/stationery/writing implements/school supplies.