Polished metal health balls to stimulate the accupressure points in your hands which in turn promotes better blood circulation and are believed to relax muscles and joints and provide general well being. These steel balls are made of base metal, a metal comonly used in jewelery. They measure 1 1/2 inches in diameter and each has a pleasant bell sound within. Hold these balls in one hand and rotate the two in circles in the palm of your hand. Simple directions are included. Brocade box may be blue, red or green.