Perfect for batting practice. Protects the heel of your hand from the knob. Made of thin shock absorbing silicone. Tightly stretches over the bat knob and stays where you position it. Two per package. For additional cushioning, use both! The added benefit is that it allows the batter to drop one or two fingers behind the bat knob. This gives you a softer hand-finger tension on the bat. It allows you to add wrist whip speed that generates explosive pop and power.