My tefillin shel yad had a cover that could slip on and off but the cover is lost and needs replacement. Is there a way I can determine the size so I can ask for a replacement? Are there standard ...
I just looked down at the little plastic cover on my arm-tefilin and it had the number 4 on it. I assume that's a size ... while tefilin must be square, there are definitely a variety of sizes out ...