Our mailing address is: 14 Aselin Drive Spring Valley, NY 10977. If you send us your Tefillin by mail please make sure it is sent via registerd mail. We do encourage shipping your items with insurance. If you're shipping your items from anywhere in the United States, an additional $9.99 will be automatically added to your shoping cart, to cover our return shipping expence. For international shipping, or expedited shipping, please contact us. Often, when the form of a letter is questionable, the Halacha requires that a child be summoned to offer his opinion. Here, Rabbi Lindner's son Yitzchak, is the "Posek" in this matter...