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ITTF Handbook 2009 / 2010
Index Description
2.03  THE BALL 
2.03.01  The ball shall be spherical, with a diameter of 40mm. 
2.03.02  The ball shall weigh 2.7g. 
2.03.03  The ball shall be made of celluloid or similar plastics material and shall be white or orange, and matt.