The product is a set of 4 new Dudley 4A-531p ASA Thunder Heat 11" leather fastpitch softballs. These yellow softball balls are designed for recreation and are suitable for softball players looking for a high-quality fastpitch ball. With a compression hardness of 375 and a COR of 0.47, these balls are made of durable leather material and are perfect for recreational games. This set of 4 balls is a great choice for players looking for a reliable and well-crafted option for their gaming needs.