The new SDI irons are the perfect compliment to the new SD Ti driver.While not square in shape, the new SDI irons have an absolutely square set up and a sleek TOUR-PREFERRED design with no offset. Plus, the wide sole creates a low CG and like the SD Ti - the highest MOI of any iron style now available. And, like our SD Ti, these irons are amazingly straight hitting with the easiest to hit long irons of any iron on the market. If you have trouble with long irons, then try the new SDI irons! You will be truly amazed at how easy the SDI irons are to hit and how well they perform!