Adi's is made of naturally shaped, smooth, Baltic amber in multiple colors, with a plastic screw-clasp. Very pretty, I'd love to get one for myself. He's been wearing it since he started teething at 3 1/2 months. Cut two teeth easy at around 4 1/2 - 5 months, is in the process of maybe finally getting some more. I noticed a marked decrease in his discomfort when we put the anklet on him. Like, he totally went back to his old, smiley self. He had been so irritated and uncomfortable and he'd bust out in crying fits.