The key chain is made of a sterling silver case inscribed in Hebrew Sefer Tehylim (Book of Tehilim) and inside is a small Hebrew printed book of Tehilim / psalms. Psalms is known as a protective amulet in the Jewish religion. Many Jews carry the Psalms with them for good luck. It was made in the electroforming method. Height: 4.5cm. / 1.772in. Width: 3.5cm. / 1.38in. 32.4gr. / 1.042oz.