We can provide you with a new duplicate key of your existing key. You will need to provide us a copy of your original cut key, and we will copy the cuts from your key onto a new key blank. We will duplicate your key using a properly calibrated German key duplication machine. Please note double-sided key means the key blade is cut on both the top and bottom. We recommend sending your key blank in a padded envelope or small box. DO NOT SEND KEYS IN STANDARD ENVELOPES. We are not responsible for keys lost in the mail on their way to our store.