St. Patricks Day Rubber Stamp - Shamrock Stamp - Green Ink ExcelMark Self Inking Stamps are the most cost effective self inking stamps on the market Features a two-sided ink pad that doubles the number of impressions and the useful life of the ink pad. It's like buying a traditional self inking stamp and getting an extra ink pad free. Clear mount base for precise alignment of your stamp impression Impression Area: 5/8" Diameter Round Available in Green Ink