These Tefillin Dakkot are made by stretching a thin layer of parchment over a structural base and are made from one piece of parchment, which is Halachially preferable. The 33mm boxes of these Tefillin Dakkot are known to be of higher quality, to be more durable and larger than those of Tefillin Peshutim Mehudarim.

The difference between Tefillin Dakkot and Tefillin Dakkot Ohr-Echad is that Tefillin Dakkot Ohr-Echad are covered with an additional layer of parchment. Tefillin Dakkot are finished in a slightly superior manner whereas Tefillin Dakkot Ohr-Echad are Halachically superior.

The Tefillin are Kosher and proofread by an expert as well as by a computer. The Tefillin come with a certificate proving the proofreading as well as a certificate proving the Kashruth level of the Tefillin. The Tefillin come with a ten year warranty.

The most common script is called beit yosef since it is the form prescribed by Rabbi Yosef Caro in the Shulchan Aruch - the primary work of Jewish law. However, the great kabbalist Rabbi Yitzchak Luria Ashkenazi promoted a script that differs slightly from beit yosef script in nine letters of the alphabet. This script is called ktav ari - ari being the Hebrew acronym for Rabbi Yitzchak Luria. Most Ashkenazi, non-hassidic Jews, as well as most Sephardi Jews, use the beit yosef script, while most hassidic and kabalistically-oriented Jewish communities use the ktav ari script.

Right or Left Handed:
If you are right-handed you wear the Tefillin on the left arm whereas if you are left-handed you wear the Tefillin on the right arm.

Ktav Beit Yossef or Ari?
Ktav Beit Yossef - generally used by those following Ashkenazi tradition, from Germany, England, Russia, Lithuanian
Ashkenazi Ari Zal - generally used by those following Chassidic Sefard tradition, from Poland, Galicia, Hungary, Romania, Slovakia

Wrapping Direction:
Outwards wrapping direction usually goes with Ktav Ari
Inwards wrapping direction usually goes with Ktav Beit Yossef.