From the Official Rules of the Womens National Basketball Association (WNBA) published in 2014, the requirements are fairly simple and straight-forward.
Official Rules
RULE NO. 1—COURT DIMENSIONS—EQUIPMENT
Section II—Equipment
Paragraph f.
(1) The ball shall be an officially approved WNBA ball with a weight not less than 18 ounces nor more than 20 ounces. The circumference of the ball shall be within a maximum of 29 inches and a minimum of 28.5 inches and 7 psi.
(2) Six (6) balls must be made available to each team for pre-game warmup.
References:
Womens National Basketball Association – https://cdn.wnba.com/sites/4/2025/04/2025-WNBA-Official-Rule-Book.pdf
Photo – www.oddsshark.com/wnba
