Mizuno t7 blue ip wedges forged with boron durable grooves the t7 wedge increases the reliability of our precise grain flow forged heads with longer lasting spin control forged from a single steel billet infused with trace amounts of boron the t7 boasts a more durable groove than normal forged wedges the teardrop shaped profile drops all the way down to a 45 degree for full shots ndash ever more popular amongst professional and elite players longer lasting grooves the use of boron in