Trodat Professional Number Stamp, 8 Digit Self-Inking Numbering Stamp, 3/8 x 2 1/4 Inches (T5558) Professional self-inking number stamp Contains 8 digits Sturdy steel frame covered by an ergonomic plastic Delivers up to 10,000 impressions before the stamp pad needs to be replaced Impression size: 3/8 x 1-5/8 inches