Secure Stamp- Impression Size: 15/16" x 2-13/16" Protect your information with the Xstamper Secure Stamp! Perfect for hiding personal information on mail and packages, also useful for prescription bottles, price tags on gifts and sensitive documents. Covered information can't be easily read, scanned or copied. Works best on printed black ink. This stamp is refillable see below to add a bottle of ink to your order. Re-Inking Instructions: Remove top and place 3 to 4 drops of ink into the openings of the stamp. Recommendations:Re-ink your stamp overnight to allow the ink to fully absorb into the stamp pad. Recommended Uses: Mail/Packages Magazines Sensitive Documents Features: Oil Based Ink Twist Cap for Leakage Protection Satisfaction Guaranteed