The ball is spherical with a circumference of between 68 and 70 centimetres (27 and 28 in), a weight in the range of 410 to 450 grams (14 to 16 oz), and a pressure between 0.6 and 1.1 bars (8.5 and 15.6 pounds per square inch) at sea level. In the past the ball was made up of leather panels sewn together, with a latex bladder for pressurisation but modern balls at all levels of the game are now synthetic.