EcoPrinty On-Line DIY Self-Inking Stamp is the fast, easy way to create your own custom self-inking stamp. Just go to the Trodat website and enter the control number found in your package. Follow the simple steps on the website to create your custom stamp with your choice of wording in 1/8" (3 mm) size letters. Then get your custom made rubber plate in the mail within 5 to 10 business days. Adhere your rubber plate to the stamp plate and you're ready to produce hundreds of thousands of clear, crisp impressions.