This acid-free, archival, permanent ink is solvent-based and appropriate for almost all surfaces. Designed for decorating non-porous and semi-porous surfaces such as metal, shrink plastic, acrylic (great for acrylic albums!), cellophane, aluminum foil, leather and some glass surfaces. Not recommended for fabric. Stamp pad measures 2.5-inch by 4-inch by 0.75-inch tall and is black in color.