LaceUp and raise the bar . Better than the typical ring donut / doughnut weights or sleeve jacket collar. Perfect for everyone including boys, girls, men / mens, females youth, or adults. Comes in black and blue to match your style. 12 oz ounce is perfect for and adult but can also be used by kids. Can be used on all bats including wood / wooden, metal, and aluminum, rubber. Swing slow or fast for increased results. Bat weights don't have to be too heavy to work. Even a small / little weight can work best. Use it as a athletic trainer to increase your skills in all aspects of your game. Great for a warm up. Throw it in your bag and have it ready.