has a moment of inertia izz about the vertical axis 26 that is at least 250 kg mm 2 more preferably the club head has a moment of inertia izz about the vertical axis 26 of at least 300 kg mm 2 preferably delta 1 is in the range of 12 25 mm more preferably delta 1 is in the range of 16 20 mm most preferably delta 1 is in the range of 17 18 mm in a modified arrangement the club head 50 may comprise a smaller driver or a fairway wood club head this smaller club head defines a head volume of less than 200 cm 3 and a mass between about 200 250 grams if such a club head 50 is desired it also can be constructed as described above by adjusting the shape and size of the strike plate 58 and the outer shell 64 as with the club bead 50 described above a smaller driver or fairway wood type club head preferably has a moment of inertia ixx about the heel toe axis 28 as set forth above in equation 1 more preferably the club head 50 has a moment of inertia ixx about the heel toe axis 28 as set forth in equation 2 the cg of the club head 50 also preferably lies at least 1 mm below the horizontal centerline 82 of the club head 50 more preferably the cg is more than 2.