Longer lasting balls. Air D-Fense Barrier Coatings in Wilson Racquet Sports DoubleCore premium ball Inner core of this ball is coated with Air D-Fense barrier to maintain the air pressure Bounce at least two times longer, increasing the playable time of the ball . How it works. Exfoliated clay is added to a liquid polymer that lines the inside of the ballThe clay plates overlap each other in a parallel mannerSince the plates over lap each other the air must travel through many layers to esca9459
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