Mizuno MX-1000 irons Hollow construction heads created by plasma welding a 'hot metal' thin steel face to a stainless steel body. Internal weights promote high, straight ball flight, with an internal Y-Tune weighting system expanded in the sweet spot into the toe to match common amateur miss-hits. The standard steel shaft is a GS95 in R and S flexes; graphite option is the Exsar IS4. Custom-built sets available from 4-SW