These mehadrin min hamehadrin tefillin are made from a behema gasa (ox neck) and written in ktav Ari (Beit Yosef) by a certified, G-d-fearing sofer stam. The tefillin are sent to you directly from the sofer stam along with a certification. Option for checking your old tefillin. We recommend calling us in order to receive a more detailed explanation about this item. 02-532-3339. Beware of forgeries! Limited time offer - receive a set of talit and teffilin bags free with your purchase of tefillin!