This replacement pad is compatible with the Trodat 4638 self-inking stamp. Add some color to this re-inkable water-based stamp pad with your choice of one of our 11 ink color choices for the most vibrant impressions possible. It lasts thousands of impressions worth of stamping and can be re-inked for extended use. Not recommended for glossy and non-porous surfaces. Select your ink color and then click the add to cart button!