Wilson A9331ASA Series Softball (12-Pack), 11-Inch, Optic Yellow COMPRESSION CONTROLLED POLYCORE: Polycore softballs don't break down as quickly; giving you unmatched durability that can't be beat SUPER SEAM TECHNOLOGY: 20% higher seams give pitcher extra control on the mound while fielders can locate the ball quicker and throw more accurately Frequency Matched Optic Yellow Synthetic Leather Cover Cor .47 / Comp. 375 lbs ASA Approved