Suitable to fit Trodat Printy 4915 as well as the Dormy Imprint 4 rubber stamps. The ink is manufactured with a water base and contains no toxic substances, no acid, no formaldehyde, and no heavy metals. The ink is hygroscopic, meaning that it self regulates by absorbing the humidity of the surrounding air so that it does not dry out, allowing prolonged usage. Changing the ink pads in rubber stamps is simple thanks to the tabs that are positioned on the side of the stamp. 6/4915 replacement ink cartridge is available in black, blue, green, red, violet. Supplied as a multiple pack of two.