The secret to the x31 success is the great detail each club has been produced with the x31 irons features an extremely deep cavity which moves weight low and back to improve the clubs heads accuracy seven durable stainless steel irons with maximum distance improving perimeter weighting the set includes 5 6 7 8 9 pw and swthe x 31 fairway wood has a unique head design helps advance the ball a long way from a variety of shot situations a very low centre of gravity helps launch the