Trodat 4645 Printy 45mm DiameterThe Trodat 4645 is a self inking stamp with an impression size of 44. 5mm. The built in stamp pad can last for thousands of impressions, and the ink pad can be replaced if needed. The ink is water based and suitable for use on non smooth paper. This stamp is perfect for use on loyalty cards, and it can also be used for certification or common seal stamps. The stamp pad can last for thousands of impressions, so you won't have to replace it very often.