The Bownet triple crown fast pitch softballs are a set of 12 yellow softballs made of leather with a 375 compression hardness. These 12-inch balls are designed for fastpitch play and feature a raised seam for enhanced performance. With a core material of polyurethane and a COR of 0.47, these softballs meet the standards set by USSSA for official play. The Bownet brand is known for producing high-quality softballs, making these a reliable choice for softball enthusiasts looking to hone their skills on the field. thanks for looking at my items for sale. good luck. contact me for any questions.