Staff Model ZM Wedge The forged Staff Model ZM Wedges feature Wilson's ZM groove pattern and Garnet Face Blasting technique. This powerful combination of a more frictional surface and deeper grooves extends the time the ball is in contact with the face at impact, resulting in higher and more consistent spin rates, even in wet conditions and poor lies. Wilson's staff professionals were instrumental in this tour-level wedge's design from inception to completion. As such, new low-bounce offerings w