Nike NDS Irons
NDS stands for Nike Distance Series.
The NDS irons are cast from 431 stainless steel which is 25% softer than 17.4 stainless steel to enhance feel.
All NDS irons have a wide sole width to facilitate getting the ball airborne and to prevent fat shots.
The NDS irons have progressive offset. The long irons have more offset to allow additional time to square the clubface; this offset is incrementally reduced throughout the set to allow more shot-making creativity.