Diadem Premier 40 Outdoor Pickleballs 12 Pack Pickleball Balls : Diadem Premier 40 Outdoor Pickleballs provide an accurate bounce and long-lasting durability. Made with high-quality PET plastic, these pickleballs are perfect for training. Diadem's proprietary formula and laser melt construction lasts three times longer than regular pickleballs. Neon Yellow for easy visibility.