The Official DREAM SEAM Fast Pitch Softballs are 12" yellow balls made of leather with machine-stitched seams. Produced by Rawlings, these softballs are designed for fastpitch play and are certified by USA Softball. With a compression hardness of 375 and a COR of 0.47, these balls are ideal for athletes looking for high-quality fastpitch balls. The lot of 21 balls includes a raised seam feature and is crafted with a cork core, making them perfect for playing at the highest levels of softball.