Wrist Snapper Ernie Parker's The Wrist Snapper is the most important tool in a pitcher's bag as it provides the benefits of strengthening the wrist and forearm and providing audible feedback for a proper wrist snap. The wrist snap is essential to dramatic ball movement on all the major pitches of successful players. The Wrist Snapper can be used at any time and is so effective but at the same time so easy to use.