The unique Mark II Reversible Stamp Pad (Black) is a dark, smudge-free stamp pad suitable for Mylar or any non-porous surface. The ink dries instantly and will reproduce when put through a blueprint machine. The Mark II is a two-sided pad housed in an airtight container, with two hinged covers to allow access to either side. The 2-1/2" x 4" inking area comes pre-inked. When one side starts to dry out, the pad is flipped over to the reverse side. While using one side, the other will renew itself. Extra ink and reactivator are available. The reactivator keeps the pad moist and the ink in solution.