Cricket Ball Specifications: Dukes, Kookaburra, and SG Balls Compared
How cricket balls are constructed, what the specifications are for weight and circumference, and how the three main cricket ball brands — Dukes, Kookaburra, and SG — differ in their behaviour for swing, seam, and reverse swing.
A cricket ball must conform to specific ICC specifications: it must weigh between 155.9 grams (5.5 oz) and 163 grams (5.75 oz) and have a circumference between 22.4 cm (8.81 inches) and 22.9 cm (9.0 inches). Within these requirements, the three major cricket ball manufacturers — Dukes of England, Kookaburra of Australia, and SG (Sanspareils Greenlands) of India — produce balls with meaningfully different properties that affect how bowlers swing the ball, how quickly the seam deteriorates, and how easy or difficult reverse swing is to generate.
Construction: What's Inside a Cricket Ball
All cricket balls share the same fundamental construction: a core of cork and rubber wound with string, covered by a stitched red (or white, or pink) leather case made from four segments. The leather outer layer is polished and lacquered on one side; over the course of an innings, one side dries out and roughens (from fielders scuffing it against the pitch and rolling it on the ground), while bowlers maintain shine on the other side. This differential in surface condition — one side shiny, one rough — is what produces conventional swing (the ball moving toward the rough side in the direction of seam travel) and, eventually, reverse swing (the ball moving opposite to conventional swing direction with an older ball). The four leather segments are stitched together by the primary seam — six rows of stitching — that provides the raised ridge bowlers use for seam-up deliveries.
Dukes Ball: England and the Caribbean
The Dukes cricket ball, manufactured in England, has a more pronounced raised seam than either Kookaburra or SG, and is known for promoting conventional swing for longer periods — it can swing appreciably even after 40-50 overs under English atmospheric conditions. The leather is softer and the seam remains more upright over the ball's life, which helps right-arm seamers who swing the ball away from right-handed batters late into a spell. The Dukes ball's behaviour in English conditions — overcast skies, cool temperatures, humid air — is one of the reasons that away touring teams (particularly from the subcontinent) struggle in England: they face a ball that behaves differently from what their home bowlers produce.
Kookaburra vs SG: Australian and Indian Conditions
The Kookaburra ball, used in Australia, New Zealand, South Africa, and several other countries, has a harder lacquer and a flatter seam than Dukes. It swings significantly in the first 20-25 overs, then the seam flattens and the ball stops swinging conventionally — making it harder for seamers to take wickets in the middle phase of a Test innings on flat pitches. The SG ball, used in India, has a softer leather but a very prominent raised seam and heavy lacquer that produces good conventional swing early and excellent reverse swing from approximately over 35 onward. India's bowlers are accustomed to the SG ball's reverse swing window; visiting teams who bowl with the SG ball find its later-life behaviour can produce either wickets or expensive leaking, depending on the bowlers' ability to exploit it.
Frequently asked questions
How much do different cricket ball brands actually affect match outcomes, and is the advantage to home teams from using their familiar ball significant enough to raise fairness concerns?
The advantage to home bowling attacks from using a familiar ball brand is real, measurable in aggregate data, and large enough to matter in individual matches — but it is generally accepted as part of cricket's home-away dynamic rather than treated as a fairness concern requiring regulatory intervention. The measurable home advantage from ball familiarity: India playing at home with the SG ball is the clearest case. India's home bowling attacks — which include bowlers who have grown up mastering SG ball reverse swing — consistently outperform their away performances (where Kookaburra or Dukes balls behave differently). India's home win rate since 2013 has been over 70%; their away win rate in Australia and England has been below 50% in the same period. While pitches and conditions are the primary driver of this gap, ball behaviour contributes. England's bowlers with the Dukes ball in swing-assisting conditions (overcast, autumn Tests) are harder to bat against for subcontinental teams than for English teams who have grown up playing against Dukes in English conditions. The team adjustment reality: touring teams and their bowlers do practice with the relevant ball brand before and during tours. Australia's pace bowlers practice Dukes swing before England tours; England's Anderson and Broad spent careers mastering the Kookaburra's early-over swing window on Australian tours. The adjustment is never complete, but it is meaningful — teams do not arrive in a foreign country naive about the ball they will be using. Why this is not a regulatory concern: unlike pitch preparation (where the home team can prepare the surface to their bowlers' strengths — something that is controversial but accepted), ball brand is determined by the host board under ICC guidelines that specify which ball each country may use. There is no option for a touring team to demand a Dukes ball in India or a Kookaburra in England. The ICC has reviewed and accepted this as part of the home-ground advantage that makes Test cricket's varied conditions one of its distinctive qualities rather than treating it as a fairness problem.