|  | SIGNALLING FOR A NEW BALL |

In Test cricket, the fielding side may request a new ball after it has been in use for 80 overs. The batsmen would be informed and the umpire would indicate the new ball to the scorers by raising it for them to see.
The new ball usually brings the quicker bowlers back on and the whole pace of the game would change with them.
The ball does get wear and tear and if it becomes ragged or out of shape in fair circumstances, we would replace it with a ball which had been used for the same number of overs.