The OEM Pentel 24/7 rollerball pen offers a free-flowing ink delivery system that ensures dark, vivid liquid ink flows smoothly to a durable metal tip for effortless writing. Featuring a 0.7mm metal tip that produces 0.35mm lines, this pen is designed for precision and clarity. The barrel color indicates the ink color, making it easy to identify. This nonrefillable rollerball pen is perfect for use at home, in the office, or at school.