JoPo Grips, a company with a new interchangeable thumb insert. This insert uses patented technology, creating a durable bowling grip that will enhance your bowling experience.
Benefits of the Twist

The thread-like feature absorbs the load of the weight and the velocity of the bowling ball delivery; i.e. visualize pulling a nut straight off a bolt without unscrewing it.
The Twist cannot be removed from the bowling ball without the inner being rotated 360º
Easy to install and superior quality compared to other systems