Maruman KS Mens Wedge Mico-Spin Finish with High precision square groove enabling a high and stable spin Hosel Pocket Shape - The curve angle on the hosel is similar to the shape of the ball, making it easier to use the wide sweet spot of the face and with a open face Joint 40 Design - By making the shaft insert 40mm, the head and the shaft creates unity and the MOI becomes larger causing more consistent shots Maruman Golf Clubs come with a 2 year manufacturer warranty that includes defects and workmanship.