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Mikshah tefillin are tefillin battim which have no filler material in the titurah (base). Why is filler material even necessary?

The photo below illustrates the thickness with a piece of filler (roughly a third of the titurah).non-mikshah bayit

Photos credit of R' Melech Michaels

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I don't have an answer for your question about filler material but I have to ask, are you asking because you are considering buying from this website? You should not buy tefillin from this website. Tefillin are meant to be black. Anyone who is selling you white tefillin is selling you invalid tefllin. – Dude Jul 3 '14 at 1:56
@Dude, white means that it has not been pre-painted. It is painted by the sofer after a careful inspection for any imperfections. This is why they are white, so that the sofer can find out whether they are mehudar or passul, rather than just relying on the (already trustworthy) hechsher. – Noach mi Frankfurt Jul 3 '14 at 3:00
Not entirely clear on what "filler" is....mind commenting/editing your answer to explain more? – Shokhet Jul 3 '14 at 3:02
Those white tefillin are pretty nifty! Do they come from white cows? ;-) – DanF Jul 3 '14 at 14:34
@Dude, actually the halacha limoshe misinai for blackness is a din in the retzuos, not the batim. We only paintvthe batim black as a hidur to match the batim. In fact the example tosafos gives for a kosher bayis other than black is a white bayis. Now, put that together with tje mishna berurah who brings that bedieved blue is halachicly black, we can market blue and white tefillin to tzionim! White battim and blue ritzuos. Again, the blue is only bedieved but hey its better than nothing. – user6591 Jul 3 '14 at 17:54

1 Answer 1

My understanding is that the filler material is needed to ensure the parallelism of the base with the rest of the tfilin, as the base is typically not thick enough on its own.

There are special tfilin made in one piece but they are more expensive. See here for instance under "One Piece" and "Hardened" Tefillin.

I remember researching this before buying my son's tfilin and I didn't find a halachic opinion that considered this a hiddur (beautification).

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Mikshah ("hardened") tefillin are a recognised hiddur, particularly in Chabad. However, most authorities hold that it is unnecessary and makes an already costly pair of tefillin into a much larger investment. – Noach mi Frankfurt 29 mins ago

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