This 6" bracelet in the photo is actually the one that I wear constantly. It offers great protection through the tourmaline and the Shungite, with reputed added protection from EMF's that we are all exposed to on a daily basis. The black tourmaline stones are 4mm, the larger matte black stones are the 6mm Shungite stones. On each side of the Shungite stones I've added a pretty 4.4mm sterling silver bead. The spring clasp is sterling silver. This particular bracelet is 7", please send me your wrist measurement for a custom made bracelet as shown above. Wear on left wrist for best results.