This pendant is a traditional Tapiz style Indian amulet that is usually used to store notes, mantra or gem stones for good luck. 

Ours is filled with the Protective & Good Luck

Breslev Mantra:

Na Nah Nahma Nahman Me Ouman

נ נח נחמ נחמן מאומן

The inscription in made  on Klaf (paper used for the Sefer Torah), and with the special ink (used for Sefer Torah & Mezzouzot also). 

All of the Breslev Peteks Mantras are written by a Sofer, checked one by one and secured in the Tapiz with layers of opaque protections.