This one is about the size of a business card, and good to use for that too.

• Max text plate size: 85 x 55mm (rectangular) with usable space of 84 x 54mm
• Replacement pad 6/511 available in Black, Blue, Red and Dry.
• Ergonomic
• For high daily office use
• Clean, precise imprints
• Very robust with steel frame

If you want a large trodat stamp that can really handle the use then this is the one for you.