Pentel JM20 Stylo Disposable Fountain Pen – Navy Blue Ink - Pack of 12The Stylo fountain pens feature an original delta shaped plastic nib designed to feel firm on one side and flexible on the other. The plastic nib helps to deliver fluid and consistent ink flow whilst writing, perfect for home, school or office. Once you start using this pen, one side will become thicker than the other allowing you to choose between thick or thin writing. Each pen contains water based ink and can produce a variety of line widths. This