Ink pads that are suitable to fit numerous Trodat Printy models: 4924, 4940, 4724 and 4740. 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. The 6/4924 replacement ink cartridge is available in black blue, green, red, violet and dual red/blue. Distributed in multiple pack of two.