High quality 8mm natural rainbow black obsidian and 4x7.5mm enhanced turquoise. Genuine 925 sterling silver spacers and S-hook. I go by wrist size (not the length of bracelet measuring end-to-end) for the best fit where on your wrist you'd like to wear it. INSTRUCTION TO MEASURE YOUR WRIST: To find the correct wrist size for your bracelet, you must measure the inside of the bracelet where it will touch your skin. Wrap around your wrist using a flexible measuring tape, measure where you would like to wear your bracelet. NO MEASURING TAPE? No problems. You may use a strip of thin paper or a thin string, mark it where it overlaps on your wrist, and then lay the strip or string flat to measure up to the mark using any ruler. *DELIVERY TIME: We ship within one business day and the delivery time is much sooner than what Amazon has estimated except for major holidays.