These high-quality Tefillin are made especially with Bar Mitzvah Boys in mind.
The Tefillin were made in Israel by Pe'er HaSTaM, have been proofread and are under the supervision of a certified scribe.

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

Clockwise or CounterClockwise Wrapping Style:
Clockwise wrapping style usually goes with Ktav Ari
CounterClockwise wrapping style usually goes with Ktav Beit Yossef.