Rubber tefillin cover protects the Shel Yad from being damaged or worn through contact with clothing, bumping, etc.
Designed to protect the tefillin corners, and help maintain their shape and squareness. Stays in place on almost any size tefillin (32-36 mm).
According to Rabbi Asher Weiss, the Kisu Yad is a hiddur mitzvah and a worthy innovation. This simple, patented device offers a solution for the issue of "roeh es ha'avir" (see Sanhedrin 89a). Rabbi Mordechai Eliyahu zt"l held that one should remove the plastic cover when reciting the brachah, but upon seeing the Kisu Yad remarked, "You don't even have to remove it when you say Birkat Tefillin."
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Great way to keep the corners of the Tefillin Shel Yad from being damaged.
This works very well as per its description.
Kisuyad is a great idea that works well.
When my father bought me my bar mitzvah tefillin, the little plastic cover that goes over the Shel Yad kept falling off in shul. So we tried this simple rubber type of cover, and it works great. He's even thinking of getting one for himself now.