How do Tefillin open? What does the inside of Tefillin batim look like?

Peshutim Mehudarim (Superior Simple Ones) teffilin have boxes made from a single strip of hide as required, and the boxes are 35mm X 35 mm on each

Large Ashkenaz Tefillin Peshutim Mehudarim

How do Tefillin open? What does the inside of Tefillin batim look like?

Tefillin for Righty wrapping outward (away) Guide how to put on Sefard Knot, Blessings for Tefillin.

How Tefillin Are Made

Do Your Tefillin Need Expert Repair? - The Layman's Guide for

Chabad Custom / Tefillin for Righty, Guide how to put on Tefillin Minhag Chabad. Blessing Tefillin.

Tefillin Dakkot Ohr-Echad Ashkenazi Tradition Arizal - Ktav Ari