This listing is for a yak bone pendant with Buddha of Compassion Mantra and it has adjustable waxed cord. It is handmade by a skilled artist in Kathmandu Nepal. It measures 1.5 inches.  In Tibetan Buddhism "Om" is the supreme and most sacred syllable, consisting in Sanscrit of the three sounds A, U, M, representing various fundamental triads and believed to be the spoken essence of the universe. It is uttered as a mantra and in affirmations and blessings. It is often understood as symblolizing the true "empty" character of reality, as that truth has been communicated by various historical Buddha, celestial Buddhas, and directly, by the true character of reality.