Upon ordering tefillin please be prepared to provide us with the following information:
If you are uncertain of the correct custom please consult your rabbi. When a custom can't be established we make the arm tefillin according to Ashkenaz custom, unless you are a Sephardic Jew, and will make the head knot in the shape of a Dalet.
If you are ambidextrous then you are considered right handed for tefillin
and wear the tefillin on your left arm. If you write with one hand and
do other activities with the other hand please consult your rabbi (if
you haven't already) to find out if you are considered right or left handed
for the purpose of donning tefillin. If you are unable to consult a rabbi
please provide us with the details and we will consult our rabbinical
authority on your behalf.