FEATURES: Helps hitters stay inside the ball to develop bat speed, stay connected longer, and become stronger through contact Hand-loaded design encourages the hitter to create bat lag, keeping the barrel in the hitting zone longer Great for use during tee work, soft toss, and live batting practice Constructed with durable silicon rubber material and is bright yellow so it is easy to find in your bag ADDITIONAL DETAILS: Attaches to the knob of most metal bats Ideal for youth baseball and softball bat sizes 12 oz weighted swing knob