The X-Performance 40 Optic Pickleballs are one of the finest balls ever created for the sport of pickleball. Using only the best PE material and our advanced single piece design, this ball will withstand hours of the most aggressive play. The X-Performance 40 balls deliver a superb flight path thanks to the precision of our machine drilled holes. Perfectly weighted and sized, these balls will certainly impress anyone on the court! These balls are USAPA approved for outdoor tournament pickleball play and are the official size and weight – 26 gram weight and 74mm in diameter.