The Oxballs Cocksling 2 has a diameter of 1 1/8 inches for the penis insertion and a length of 2 inches. It’s extremely stretchy without losing its comfort. While it is best to have at least a rough idea of your own measurements before purchasing any product, I personally feel that the Oxballs Cocksling 2 will fit most people comfortably, even if your penis is a little above or below average size.