The OEM Pentel 24/7 rollerball pen features a free-flowing ink delivery system that provides dark, vivid liquid ink through a durable metal tip for smooth, effortless writing. The 0.7mm metal tip produces 0.35mm lines, ensuring precision in every stroke. The barrel color indicates the ink color, making it easy to identify at a glance. This nonrefillable rollerball pen is ideal for use in home, office, and school settings.