This replacement pad is compatible with the Trodat 4645 & 46145 self-inking stamp. It features water-based ink that is great for stamping on documents, flyers, non-corrugated cardboard, envelopes and more. Choose from our 5 standard or 6 premium ink color options when you order this pad and enjoy thousands of impressions. Re-ink it with water-based ink for continuous use. Not recommended for glossy and non-porous surfaces. Select your ink color and then click the add to cart button!