This Pentel EnerGel Xm pen features a convenient retractable design with a chunky, metallic-look barrel and rubber grip for comfort in use. With revolutionary, refillable liquid gel ink, the EnerGel formula is quicker drying and smoother flowing than ordinary gel ink, giving a similar sensation to liquid ink. The medium 0.7mm tip writes a 0.35mm line width for general use at home, work, or at school.