What are the requirements for the shin (letter) embossed on the tefillin housing, and does switching the three-headed and four-headed shin sides invalidate?

Must the four Torah passages for tefillin be written in the order they appear in the Torah, and is tefillin written out of order invalid?

4 opinions

Should the arm-tefillin passages be written before the head-tefillin passages, or does it not matter?

3 opinions

Must the head-tefillin's four passages each be written on a separate parchment, while the arm-tefillin's four passages are written on a single parchment?

1 opinions

Must tefillin be written with black ink, and does writing even one letter in another color or in gold invalidate the tefillin?

2 opinions

Must each letter in tefillin be completely surrounded by parchment and not touch another letter?

2 opinions

Must tefillin be written with the right hand, and are tefillin written with the left hand invalid?

2 opinions

How many lines must be scored (ruled) when writing tefillin, and may lead be used for scoring?

3 opinions

On which side of the klaf (parchment) must tefillin be written, and what are the requirements for the type of parchment?

1 opinions