Worry stones sometimes called Nerve Stones, these are actually genuine onyx stones from Mexico. They are used to calm the nerves and relieve tension. Carry one with you in a white flannel bag (not included), and when things get rough, take the rock and simply rub the smooth stone surface until your nerves are calm and the stress is gone. Carry in your pocket at all times. Comes in assorted colors. We reserve the right to ship any color available.