It's a religious obligation for Jews: affixing a mezuzah on their door post. It's a sign those inside live a Jewish life.
"These are the mezuzah, which are from Israel, written by scribes. It’s hand-written,“ said the Chabad Mitzvah Society Director Mendy Ceitlin.
The Chabad Mitzvah Society in Crown Heights, Brooklyn, created these do-it-yourself kits, providing a step-by-step guide for putting up a mezuzah.