Stamping leather and paper. 0-1-2-3-4-5-6-7-8-9 (a-b-c-d-e-f-g-h-i-j-k-l-m-n-o-p-q-r-s-t-u-v-w-x-y-z). If item is defective after 3 months, you can still send it back to us. We will send you a new one after receiving the defective item.