8 mm and tank (2 pcs ) of Hematite Powerful Magnetic Bracelet for Arthritis Pain Releif or for Sports Related Therapy or for antidepression Genuine Wide Hematite bead magnetic bracelet Adjustable, Elastic, Stretch Bracelet Fits Men and also for Women stretch bracelet Magnets are beleived to give you healthy blood circulation and help heal arthritis, and general aches and pains Hematite is believed to give you positive energy thus give you happiness and take away depression