A shaft set includes plural shafts used for wood-type golf clubs each having a length of 40 inches to 48 inches. The method includes identifying a first color name of the first color and a second color name of the second color based on the coordinates. The first-side connecting portion is connected to the first side plate so that the first side plate does not move with respect to the connecting member. The first buried layer is formed of an N+ type first impurity-doped layer and an N type second impurity-doped layer that extends beyond the fist impurity-doped layer.