It requires a slightly stronger throwing arm to use than the club, but once mastered can produce deliveries that can test and challenge the very best of batters.
Used by Graham Gooch and Andy Flower in the England set-up
The pro can provide a level of quality practice that is impossible to better.
Where previously a very talented bowler would have to run-up 20 or 25 yards to bowl a ball of similar quality
Now a skilled coach can provide 80mph swinging, seaming deliveries to really iron out any flaws or defects in a batsman's game.