Markwort PowerSwing Baseball and Softball Donut Bat Weight Set - 4 Oz, 8 Oz and 12 OzThree Weights for Versatile Training: This set includes 3 different weight options 4 oz, 8 oz, and 12 oz allowing you to progressively increase resistance and challenge your swing. Durable Construction: Made from high quality, durable materials, these weights are designed to withstand repeated use during training sessions without damaging your bats. Easy to Use: The weights fit securely on the end of your bat with and fits most baseball and softball