Address Stamp Custom Custom Ink Personalization Return address stamps, personalize up to 3 lines of text on this customizable auto-inkjet stamp. Perfect wedding invitation, address label, Return address stamp, small :9/16" x 1-1/2" - Medium :11/16" x 1-7/8" - Large :15/16" x 2-3/8". Color options - black, blue, green or red ink. The self-inking design allows for fast, repetitive stamping, and a clear mounting bottom. We use quality machines and materials to ensure a clear impression and lasting stamp.