This set of 12 AD Starr Tattoo softballs are perfect for any softball game. With a compression hardness of 300 and a COR of 0.52, they meet USA Softball association standards. This set was made exclusively for the 2015 NAGAAA World Series. The yellow color makes them easy to spot on the field, and the size of 12 inches ensures they are regulation size. The balls come from a trusted brand, AD Starr, and are designed for use in slowpitch softball. Whether you're a seasoned player or just starting out, these softballs are an excellent choice. They are part of the Tattoo product line and will make a great addition to your gear.