Mini%20Metro%20Balls%20are%20our%20fun%20new%20way%20of%20adding%20some%20colorful%20style%20to%20your%20play%20time!%20Metro%20Balls%20are%20the%20perfect%20colorful%20addition%20to%20your%20small%20dog%20or%20cat’s%20toy%20box.%20Unlike%20standard%20tennis%20balls%2C%20Metro%20Balls%20are%20specially%20designed%20for%20pups%2C%20have%20zero%20petrochemicals%20and%20are%20made%20with%20cotton%20yarn%20and%20natural%20rubber.%20Mini%20size%202%26quot%3B%20ball