The little ball in bocce is called a pallino and is also sometimes called a marker or a jack ball. It is generally either white or yellow. Most bocce ball sets feature pallinos that are between 40 mm (1.57") and 60 mm (2.36"). The International Standard is 40 mm (1.57") and the most popular size in the US, regardless of price point, seems to be 50 mm (1.97").