"The Pin" is the latest of BowlU's Training Tools. "The Pin" teaches a proper thumb exit so that your bowling ball is not so sensitive to oil movement, thus allowing you to follow transition more effectively. The modern release is easily taught, trained, and monitored with "The Pin".
Note: Because we are hand pouring all of the training tools and working with these materials is still very much a learning process for us, inevitably there are aesthetic imperfections on most training tools, namely in the form of air bubbles. Having said that, the value of these training tools is in their functionality, and you have our word that we will never ship anything out that has imperfections in functionality.