The Mark II Reversible Stamp Pad is the first stamp pad that can be pre-inked with fast drying ink and stay moist for months. The air-tight plastic container has two hinged covers. When not in use, the construction of the pad prevents the evaporation of the ink. In use, one side always remains closed. When the side in use begins to dry out, the pad is simply reversed and the second side is ready for use. While the second side is being used, the first side rejuvenates iteslf and is ready when needed. The ink surface is 2.5" x 4" and the pad is available dry or pre-inked with black AERO #1250 Ink.