This replacement pad is compatible with the Trodat 4911 & Trodat 4820 self-inking stamps. This pad uses water-based ink which works on documents, prints, non-corrugated cardboard, invitations and more. Choose from our 11 ink colors when you order this replacement pad and make the best impression. 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!