Water-based ink. It works great on standard papers but not on non-porous surfaces such as glossy papers or vinyl.
When the ink starts to run low, you can refill the stamp pad with the Trodat Ideal Replacement Ink.
Stamp models: We use high quality self inking stamps, including the Trodat, COLOP and Shiny. We determine which model to use for your order based on the size, design and availability.