DETAILS: These official competition-grade pickleballs are 26 grams in weight with a 74mm diameter to conform to official USA Pickleball standards The balls are constructed with 40 precisely machine drilled holes for a balanced flight pattern and tight, reliable spin The no-seam, one-piece construction ensures a stronger, longer lasting ball that resists dents and cracking The X-40 is approved for outdoor tournament play by USA Pickleball and was selected as the official ball for the US Open Pickleball Championships Includes (12) X-40 pickleballs so you'll have more than enough for games and practice