Size 5: This is the standard-sized soccer ball used in professional and international soccer matches. It has a circumference of 27 to 28 inches (68 to 70 cm) and a weight of 14 to 16 ounces (400 to 450 grams).
Size 4: This soccer ball suits players aged 8 to 12. It has a circumference of 25 to 26 inches (63 to 66 cm) and a weight of 12 to 13 ounces (340 to 370 grams).
Size 3: This soccer ball suits players aged 4 to 8. It has a circumference of 23 to 24 inches (58 to 61 cm) and a weight of 11 to 12 ounces (310 to 340 grams).
Size 2: This size soccer ball is often used for training or for playing mini-soccer games. It has a circumference of 20 to 22 inches (50 to 55 cm) and a weight of 8 to 9 ounces (225 to 255 grams).