Written by hand
By a trained sofer stam, with a quill and black dyo ink, on parchment prepared from a kosher animal. A printed or photocopied scroll is never kosher, however convincing it looks.

Handwritten on parchment by a certified sofer, checked by hand and by computer
$96
Written and checked in Thornhill, Ontario
The klaf should sit inside the case with a little room at each end. A scroll is never trimmed or forced to fit.
Two passages, written by hand

A mezuzah is not the decorative case on your doorframe. It is the small piece of parchment inside it — the klaf — and without it the case is only a case.
On it a trained scribe hand-writes the two paragraphs the Torah asks to be set on the doorposts of your house: the Shema, and V’haya im shamoa. Twenty-two lines of Hebrew in the traditional Assyrian script, ktav Ashuri, written in order and read right to left.
The scroll is rolled from left to right so the text faces inward, and on the reverse is the Name Shaddai — read also as an acronym for Shomer Daltot Yisrael, Guardian of the doors of Israel. The case protects the klaf; the klaf is the mitzvah.
שְׁמַע יִשְׂרָאֵל יְהוָה אֱלֹהֵינוּ יְהוָה אֶחָד
“Hear, O Israel: the Lord is our God, the Lord is One.”
Deuteronomy 6:4
כְּלָף
KlafThe parchment scroll
סוֹפֵר
SoferThe trained scribe
שַׁדַּי
ShaddaiA Name of God
What makes a scroll kosher
By a trained sofer stam, with a quill and black dyo ink, on parchment prepared from a kosher animal. A printed or photocopied scroll is never kosher, however convincing it looks.
Each letter must be complete, correctly formed and touching no other, written in sequence from the first word to the last. One broken or missing letter makes the whole scroll pasul — invalid — and the sheet begins again.
Before the first stroke the sofer declares that the writing is for the holiness of a mezuzah. The intent is not a formality; it is part of what makes the scroll valid.
Every scroll is read by Rabbi Abitbol and run through a verification program that compares it letter by letter against the text.
Ink cracks and fades. A mezuzah should be taken down and checked by a sofer twice in seven years.
הרב אשר אביטבול
Mohel · Shochet · Sofer Stam
Ordained yoreh yoreh by the Chief Rabbinate of Israel, and working out of Thornhill, Ontario. He writes, checks and sells tefillin, mezuzot and tallitot, and teaches for bar mitzvah.
Every POPPSI scroll is written and verified by him before it reaches us.
How and where to affix it
On the right doorpost as you enter the room or home.
In the lower part of the top third of the doorway, within a handbreadth of the outer edge.
In Ashkenazi custom, tilted so the top slants into the room; Sephardim affix it vertically.
A mezuzah is required on the entrance and on nearly every interior doorway of a home, including living spaces and bedrooms, but not on bathrooms or very small rooms. Fix it firmly at both ends, so it is attached to the doorpost rather than merely hung.
בָּרוּךְ אַתָּה יְהוָה אֱלֹהֵינוּ מֶלֶךְ הָעוֹלָם אֲשֶׁר קִדְּשָׁנוּ בְּמִצְוֹתָיו וְצִוָּנוּ לִקְבֹּעַ מְזוּזָה
“Blessed are You, Lord our God, King of the universe, who has sanctified us with His commandments and commanded us to affix a mezuzah.”
Recited immediately before fixing the mezuzah to the doorpost. When putting up several at once, one blessing covers them all.
The case is the frame. The scroll is the mitzvah.