The thickness of the straps in Tefillin has decreased | Tefillin straps | Ask the Rabbi - SHEILOT.COM

The thickness of the straps in Tefillin has decreased

Question

The thickness of the straps at the knot of the Tefillin has decreased to 8 mm. Have I fulfilled the obligation?

Answer

No, it requires at least 10 mm, and preferably 11 mm.

Source

Shulchan Aruch, Orach Chaim, Siman 33

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