Equipped with genuine rock rosin to get the same grip on the mound that the pros do, the Marucci(R) Pro Rosin Bag encourages consistent performance by improving grip in any conditions. Enhanced Grip, Heightened Performance: Genuine rock rosin powder enhances grip for maximized ball control Pro-inspired sock offers premium durability to minimize tears Ideal for pitchers to reduce moisture on their hands and maintain grip Additional Details: Model: MMPROROSIN Marucci