As its name implies, the uni-ball Power Tank RT ball point pen is equipped to perform in extreme conditions. With incredibly fast, free-flowing ink, and rugged design, these all-terrain retractable pens deliver smooth, clean writing even on wet surfaces and in cold temperatures. These click pens come with a textured grip that provides comfort and control in the face of punishing weather. The Power Tank RT also features exclusive uni Super Ink, a pigment-based ink that forms an indelible bond with paper to protect against water, fading, and fraud. These versatile pens have a convenient retractable design.