These necklace and bracelet feature black obsidian natural stone chips with a few black Czech glass beads sprinkled in. - The necklace is adjustable 18-21 inches using its silver-plated lobster clasp and extender chain. - The wrap bracelet is on stainless steel memory wire which self-adjusts to wrist size 5 1/2 to 10 inches, easily wraps around your wrist, stays on without a clasp, and returns to original size when removed.