Pair Stress Relief Iron Ball / for Hand Exercise Taiji Style - Hand Grip Squeeze Finger Therapy While rolling on your hand it can help to relief your stiffness and relax your entire hand just like a finger THERAPY Reliefs your muscle and joint all together. The ball is BLUE colored - 1 3/4" diameter 4 oz Hold 2 with 1 hand and rotate in your palm! This set comes with 2 Blue Taiji style balls ( Taiji is one of the mystery Asian symbols for healing, balancing). Case color might be different!