head tefillin, Jerusalem, Israel The manufacturing processes of tefillin are intricate and governed by hundreds of detailed rules.
Boxes In earlier Talmudic times, tefillin were either cylindrical or cubical, but later the cylindrical form became obsolete. Nowadays the boxes should be fashioned from a single piece of animal hide and form a base with an upper compartment to contain the parchment scrolls. They are made in varying levels of quality. The most basic form, called
peshutim ("simple"), are made using several pieces of parchment to form the inner walls of the head tefillin. The higher quality tefillin, namely
dakkot ("thin"), made by stretching a thin piece of leather, and the more durable
gassot ("thick") are both fashioned from the single piece of hide. The main box which holds the tefillin scrolls, known as
ketzitzah (קציצה), is cubical. Below it is a wider base known as the
titura (תיתורא). At the back of the
titura is a passageway (''ma'avarta'', מעברתא) through which the tefillin strap is threaded, to tie the tefillin in place. On both sides of the head-tefillin, the Hebrew letter
shin () is moulded; the
shin on the wearer's left side has four branches instead of three. Nowadays it is customary to paint the tefillin black, but archaeological findings show that it is not certain that it was always this way.
Straps Black leather straps (''retsu'ot'') pass through the rear of the base and are used to secure the tefillin onto the body. A stringent opinion requires them to be black on the inner side too, but more commonly the inner side is left the color of leather. The Talmud specifies that tefillin straps must be long enough to reach one's middle finger, and records the practice of Rav
Aha bar Jacob to tie and then "matleit" (plait? wind three times?) them. However, the passage leaves unclear where the measuring is done from, whether the reference is to hand- or head-tefillin, and what exactly the meaning of "matleit" is. Combining and interpreting the Talmud's statements,
Maimonides,
Tur, and
Shulchan Aruch ruled that the strap of hand-tefillin must reach from where the tefillin is placed on the arm, as far as the middle finger, where it must be wound three times around the middle finger.
Rema wrote that it is not necessary to wind around the finger (rather, the straps must be long enough that one
could wind around the finger); however, this leniency does not appear in his comments to the Shulchan Aruch. In addition to the windings around the finger, the Shulchan Aruch states that the custom is to wind six or seven times around the forearm.
Parchment scrolls The four biblical passages which refer to the tefillin, mentioned above, are written on scrolls and placed inside the leather boxes. This is because the verses describe the hand-tefillin in the singular ("sign"), while in three of four verses, the head-tefillin is described in the plural ("
totafot"). The passages are written by a
scribe with special ink on parchment scrolls (
klaf). The texts have to be written with halachically acceptable (acceptable according to Jewish law) ink on halachically acceptable parchment. There are precise rules for writing the texts and any error invalidates it. For example, the letters of the text must be written in order - if a mistake is found later, it cannot be corrected as the replacement letter would have been written out of sequence. There are 3188 letters on the parchments, and it can take a
sofer (scribe) as long as 15 hours to write a complete set.
Ordering of scrolls (Rashi and Rabbeinu Tam tefillin) Talmudic commentators debated the order in which scrolls should be written in the hand tefillin and inserted into the four compartments of the head-tefillin. There are two additional opinions of the Shimusha Rabba and the Raavad, who hold that like Rashi and Rabbeinu Tam respectively, but they hold that the scrolls are placed in the head tefillin in mirror image of those opinions. It is often claimed that of the tefillin dating from the 1st century CE discovered at
Qumran in the
Judean Desert, some were made according to the order understood by Rashi and others in the order of Rabbeinu Tam; Nowadays, the prevailing custom is to arrange the scrolls according to Rashi's view, but some pious Jews are also accustomed to briefly lay the tefillin of Rabbeinu Tam as well, The
Vilna Gaon, who wore the tefillin of Rashi, rejected the stringency of also laying Rabbeinu Tam, pointing out that there were 64 possible arrangements of the tefillin scrolls, and it would not be practical to put on 64 different sets of tefillin to account for all possibilities. The
Shulchan Aruch rules that only "one who is known and famous for his piety" should put on Rabbeinu Tam tefillin, while the
Mishnah Brurah explains that if any other person puts on Rabbeinu Tam tefillin, it is a sign of arrogance. The placement of the protrusion of a tuft of calf hairs (''se'ar eigel'') identifies as to which opinion the tefillin were written. ==Obligation and gender==