X-40 Pickleballs are made for premium play and performance and are the official pickleball balls of the US Open Pickleball Championships! Designed with precision-drilled holes and constructed from durable polyethylene, the X-40 outdoor pickleballs are built to outperform and outlast other pickleballs on the market. The machine-drilled holes on each pickleball ensure steady flight patterns and reliable spin on every ball for a consistent feel to your pickleball games. The ultra-durable polyethylene construction prevents denting and cracking even on outdoor courts, so you can keep playing all season long.