The CSI white perforated golf ball is perfect for at home golf training. Many people chip these balls around on the carpet to make tremendous strides in their short game. The CSI golf perforated balls are 1 5/8 inches in diameter, the same size as any official golf ball. These golf balls can also be used to practice full swings with any club. They are perfect for backyard training because they will never go too far due to the lightweight perforated design.