The Pentel Energel Roller Pen 0.5mm in Black & Blue &  Red & Green is a smooth-writing pen that features quick-drying, acid-free ink that resists smudging and fading over time. The pen is designed with a needle tip that allows for precise and consistent lines, making it a popular choice among artists, writers, and students. The Energel ink technology ensures that the pen glides across paper smoothly, providing a comfortable writing experience. The pen also features a sleek and durable barrel with a metal clip for easy portability. Ideal for everyday use, the Pentel Energel Roller Pen 0.5mm in blue is a reliable writing instrument that delivers high-quality results.