Tefillin are worn during weekday morning prayers by males aged 13 and older. They are worn adjacent to the mind and the heart and serve to connect one's mind and heart to that of the Creator.
tefillin are made under the certification of the Vaad Mishmereth STaM (acronym for Torah scrolls, tefillin and Mezuzahs).
The boxes (Batim) are molded from different types of skin. They have hand written Parchments (Parshiot) put together by a Soffer.
Tefillin vary by size and the type of leather used to mold the boxes and quality of workmanship.
All tefillin sets are enclosed in sturdy hinged acrylic boxes (shown in picture), have heavy gauge straps and are hand-crafted in Jerusalem, Israel. All tefillin sets are nusach Ashkenaz except where specfied.