Size : 3.7 x 3.7 cm Application : Semi-porous and non-porous surfaces. Plastic Metal Shrink Plastic Rubber Leather Polymer Clay Photo Glass Wood Porcelain Terracotta Cellophane - StazOn may smear on Japanese Papers, vellum, cloth, and unpainted wooden surfaces. - Carefully apply inked stamps to non-porous surfaces. Images may be able to be erased from some non-porous surfaces with StazOn Cleaner. - Clean stamps immediately after use with StazOn Cleaner. - StazOn may be transformed clear stamps. Test before using. - Jet Black (color #31) is archival. - Replace inner plastic cover and cover immediately after use. Exposure to air will cause the ink in the pad to dry out. - Make sure stamp is free of oils or residue before using with StazOn. - Stamped images on non-porous surfaces may rub off if handled repeatedly.