This ballpoint pen is equipped with a Bren system that controls the amount of vibrating that occurs when writing. A high level of airtightness has been achieved by eliminating the gap between the parts of the pen. The center of gravity has also been lowered, which helps to prevent blurred writing. Measures 0.5 mm and comes in blue green. Made in Japan. Mechanical Pencil & Ballpoint Pen Pen: 0.5mm, 0.7mm Pencil: 0.5mm Pen: Red, Black Blen