Do-It-Yourself Self-Inking Stamps offer a fast, easy way to create your own custom self-inking stamp with free online access. Simply enter the control number found in your package. Follow the steps to create your custom stamp with your choice of wording in 1/8" (3mm) size letters. The 4912 includes up to four lines with 21 characters. Your custom-made rubber plate ships to you in just one or two business days. Small, lightweight design allows easy impression positioning and consistent use. Self-inking design lets you quickly create clear, crisp impressions in blue ink. Water-based ink formula is nontoxic for safe handling and use. Environmentally friendly construction is made with post-consumer material to help minimize its global impact.