An outswinger is bowled by holding the cricket ball with the seam at an angle and the first two fingers running along either side of the seam. The ball must be released at 12 o'clock height. The hands should move slightly towards the left at follow through and must push down for more back-spin. Once the ball has worn on one side the shiny side should face the leg side and the seam towards first or second slip for swing. The difference of pressure caused by movement of air over the rough and smooth surfaces tends to push the ball to the left. The result is that the ball curves, or swings to the left. In case of a new ball point the seam to the direction of swing. The difference of the separation of air by the seam the ball moves away from the batsman.
