New, unused, but has been opened once to check the product. This is a size L Sam Jack. It's a tool that goes in the thumb hole of a bowling ball to make it easier to grip the ball. If you hold the ball with your thumb bent, you won't get good spin and won't be able to utilize the ball's natural movement. Using this Sam Jack naturally prevents your thumb from bending, so it's worth using for people who have a habit of gripping.