Uni-Ball Ballpoint refill, Refill & ink series ink (Power Tank

Pressurized ink refill works at odd angles and in cold weather or wet conditions.
Works in extreme conditions:
Writes on wet surfaces, upside down, and in super cold temperatures.
Protects against water, fading and fraud.
Fast and free-flowing ink, smooth and clean writing.
1.0 mm bold tip that delivers outstanding readability.