Trodat 4915 - Large Self Inking Stamp Customization Instructions: Click on 'Customize Now' on the right and follow instructions. Stamp impression area is 1" x 2-3/4". Customize up to 5 lines of text. Built to last. Stamps over 1000 impressions before needing to be re-inked. Self-Inking with the pad inside makes it quick and easy to stamp