Cricket Ball Construction — How a Cricket Ball is Made
Understand how a cricket ball is constructed — the cork core, leather panels, raised seam, and how ball construction affects swing, spin, and bounce.
A cricket ball is a highly engineered piece of equipment whose construction directly affects how it behaves in flight, off the pitch, and as it ages through an innings. Understanding how a cricket ball is made helps explain why seam bowling, swing, reverse swing, and spin behave as they do — each technique exploits a different physical property of the ball's construction.
Core Construction
A cricket ball has a core made from compressed cork and rubber, wound tightly with layers of twine. This core gives the ball its weight (155.9–163 grams as specified by the Laws) and hardness. The bounce a ball produces depends significantly on core density — a harder core produces more carry off the pitch.
The Leather Outer
Four pieces of premium leather — traditionally cowhide, tanned and treated — are stitched around the core in two hemispheres. The quarter seam joins the panels at 90 degrees to the main seam, holding the ball's shape. The leather is polished on one side during manufacturing and over time develops contrasting rough and smooth surfaces through play.
The Seam
The prominent raised seam — formed by 6 rows of stitching along the equator where the two leather hemispheres meet — is the most critical feature for bowlers. The seam interacts with air pressure differentials to produce movement. Holding the seam upright with backspin allows it to grip the pitch and deviate. In flight, the seam can create asymmetric airflow, causing swing.
Red, White, and Pink Balls
| Colour | Used In | Characteristics |
|---|---|---|
| Red | Test cricket | Swings well when new; reverses when old and rough |
| White | ODIs and T20s | Easier to see under lights; deteriorates faster; used in pairs (one per side) in ODIs |
| Pink | Day-night Tests | Visible under artificial lights; behaves similarly to red but with different durability |
Ball Care and Maintenance
Fielding teams are permitted to maintain the ball using sweat and saliva (though saliva has been restricted in some formats following COVID-era protocols). Shining one side and roughing the other — by natural play and rubbing on the ground — creates the aerodynamic asymmetry that produces reverse swing. Artificial interference (ball tampering) is illegal and results in a 5-run penalty.
Frequently asked questions
How heavy is a cricket ball?
A cricket ball must weigh between 155.9 and 163 grams (5½ to 5¾ ounces) as specified in the Laws of Cricket. The circumference must be between 22.4 and 22.9 centimetres.
Why do bowlers keep one side of the cricket ball shiny?
Maintaining one side shiny and letting the other roughen creates aerodynamic asymmetry. The rough side creates more turbulence in the airflow, while the shiny side experiences smoother laminar flow. This pressure difference causes the ball to swing in the air — either conventionally (away from the shiny side when new) or in reverse (toward the shiny side when old).