Illinois Professional Engineer Stamps. Our self-inking stamps have a built in stamp pad: the die is rotated against the stamp and produces the image stamped to paper each time it is used. This product is laser engraved in our facility to insure high quality and longevity of impression and overall product. We have a variety of colors available to choose from. Self-inking stamps will last for thousands of impressions and upon its lifetime use, you only need a replacement pad or ink; these can be found under Ink, Pads, Etc. category.