Width of the Tefillin Retzuah (Straps)

The Retzuah of Tefillin needs to be a minimum width of a seorah (barley cornel). According to R. Chaim Naeh this is 10 mm. In a pressing situation 9 mm is still enough to recite a blessing on the Tefillin. This minimum width requirement applies even to the beginning section of the retzuah that protrudes from the yud shaped knot on the Tefillin Shel Yad.

Shulchan Aruch Admor Hazaken (Orach Chayim 27:20). Ketzos Hashulchan in the supplements of vol. 1 (p. 89).

Even when serving Hashem in our own unique way, it must be within the boundaries so designated by our Sages. 

                                           Li'ilui Nishmas Elka bas Yehudah


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