A ball seems like the simplest piece of equipment on the table, but size, material, and star rating all meaningfully affect how it plays. Here is what those numbers and letters actually mean.
Ball Size: Why 40mm Became Standard
Table tennis balls were historically 38mm in diameter until the sport's governing body increased the standard to 40mm in the early 2000s. The larger ball moves slightly slower and offers marginally more visible spin, changes intended to make professional matches more watchable for spectators and broadcast audiences. Every ball sold for competitive play today uses the 40mm standard.
Understanding Star Ratings
| Rating | Typical Use | Quality Level |
|---|---|---|
| 1 star | Casual, recreational play | Lower roundness and durability tolerance |
| 2 star | Club-level practice | Mid-range consistency |
| 3 star | Official competition | Strictest roundness, bounce, and material standards |
For serious practice or any competitive play, three-star balls are worth the extra cost. Their consistency directly affects how reliably you can read spin and bounce, which matters far more once your technique reaches an intermediate level or beyond.
Poly vs Celluloid Balls
Table tennis balls transitioned from celluloid, a flammable material that posed shipping and safety concerns, to poly plastic balls starting in the mid 2010s. Poly balls are slightly larger in practice, bounce a little differently, and require marginally more effort to generate the same spin as the older celluloid balls, a change that affected professional technique and equipment choices industry-wide.
Color: White or Orange
Regulation balls come in white or orange, and the choice is based purely on table and background color contrast rather than performance. Tournaments typically use whichever color offers the best visibility against the table color and playing environment.
Frequently Asked Questions
What does the star rating on a table tennis ball mean?
Star ratings, typically from one to three stars, indicate ball quality and roundness consistency. Three-star balls meet the strictest manufacturing tolerances and are the only balls approved for official ITTF competition.
Are all table tennis balls the same size?
Modern regulation balls are all 40mm in diameter, a size standardized in the early 2000s to slightly slow down the professional game. Older 38mm balls are no longer used in competitive play.