Manufacture and contents thumb|Ashkenazi head tefillin, Jerusalem, Israel thumb|Leather moulded into shape for the head-tefillin thumb|Silver and leather teffilin case made in Germany in 1885 The manufacturing processes of tefillin are intricate and governed by hundreds of detailed rules.
Manufacture and contents thumb|Ashkenazi head tefillin, Jerusalem, Israel thumb|Leather moulded into shape for the head-tefillin thumb|Silver and leather teffilin case made in Germany in 1885 The manufacturing processes of tefillin are intricate and governed by hundreds of detailed rules.