This replacement pad is compatible with the Trodat 4931 and 4731 self-inking stamps. It features water-based ink that is great for stamping on documents, flyers, non-corrugated cardboard, envelopes and more. Spruce up your impressions with one of our 11 stunning ink color options. It can even be re-inked with water-based ink for continued use. Not recommended for glossy and non-porous surfaces. Select your ink color and then click the add to cart button!