ClassiX ECO Self-Inking Message Stamp - Impression Dimensions: 5/8" x 2-5/16". ClassiX ECO self-inking message stamps have all the great benefits of our traditional P-Series but are constructed with 53% recycled content by weight. This EP12 can be re-inked by adding ink to the ink pad or you can replace your ink pad. Use ClassiX Refill Ink only to re-ink your stamp.