Many bowlers also develop a " slower ball" these are bowled with the same arm action as their normal delivery, but come slower from the hand, usually due to the bowler gripping the ball differently or cocking his wrist at the last moment.
A batter who has been "softened up" by a series of bouncers, which pitch nearer the bowler than normal and reach the batsman around head height, or even hit the batsman, may tend to play the next ball on the back foot, and thus be susceptible to a full-length yorker delivery that bounces at his toes.
Pace bowlers frequently dismiss batsmen through variation and deception. They may use leg cutter and off cutter but mainly rely on variations and deception. Slow bowlers have bowling action of a seam bowler, but bowl at a speed of 90–110 km/hr. Sri Lankan Lasith Malinga, England's James Anderson, Indians Zaheer Khan and Irfan Pathan are prominent bowlers known for the use of reverse swing. This is known as reverse swing and has become an increasingly important skill in the last 10 to 15 years. Wasim Akram and Waqar Younis of Pakistan, James Anderson of England and Dale Steyn of South Africa are masters of this skill, and are capable of causing an older, misshapen ball to swing the opposite way from normal, i.e. Swing bowlers are more effective than sheer pace bowlers as the swing can confuse a batsman. Though younger pace bowlers tend to rely exclusively on speed, as bowlers age they tend to develop this more sophisticated art of swing bowling. In addition, bowlers of express pace do not tend to get as much swing as the fast-medium-to-medium pace bowlers. However balls which have been in play for some time do not tend to swing so much due to the deterioration of the seam. In addition to a well-polished ball, other factors help the ball to swing, notably damp or humid weather conditions. By changing the orientation of the ball in his hand, a bowler may therefore cause the ball to swing into or away from the batsman. The differing airflow around the two sides will cause the ball to swing in the air, towards the roughened side. This is further encouraged by systematically polishing one side of the ball while allowing the other side to become roughened and worn. Swing bowlers are pace bowlers who, apart from being fast, also use the seam of the ball to make it travel in a curved path through the air.