These balls are all ASA certified 12" slow pitch game softballs. They're made with a long-lasting durahide cover and come in optic yellow, which helps with visibility and tracking the ball. Stitched with flat red seams to minimize wind resistance. All have a solid polyurethane core, .52 COR, and a 300 Compression rating. These softballs are sold by the dozenget 12 softballs in one order.