Fluid. Won't leak in flight. When inspiration strikes, count on the performance and design of Uni-Ball. Consistent, free-flowing ink delivers fluid writing the moment pen hits paper. Airplane safe-ink will not explode or leak due to a change in cabin pressure during flights. Exclusive Uni-Flow Ink System provides consistent smoothness and color intensity. Features Uni Super Ink that helps prevent against check and document fraud. Archival quality and acid-free ink. Guarantee: Newell Rubbermaid Office Products guarantees smooth, worry-free writing with every Uni-Ball pen. If you're not completely satisfied with our product, simply return it for replacement or a full refund. In the United States, return to: Newell Rubbermaid Office Products, 2707 Butterfield Road, Oak Brook, IL 60523, Attn: Consumer Affairs. www.uniball-na.com. Made in Japan.