An iron-type golf club head is disclosed including a main body including a heel portion, a sole portion, a toe portion, a top-line portion, a front portion, a rear portion, and a striking face. Preferably, the active substance comprises or consists essentially of FK506, such as FK506 in the form of a powder with a grain size smaller than 15 micron or a paste with a base of FK506 with a viscosity not lower than 100,000 to 120,000 cps. The user’s personal computing environment data is also used for interfacing with the user’s Web browser. The catheter has reduced impact force compared to similar suction catheters without the plurality of apertures near the distal tip. The intermediate layer includes a first intermediate layer disposed in contact with the first light-emitting layer and mainly containing a first intermediate material and a second intermediate layer disposed in contact with the second light-emitting layer and mainly containing a second intermediate material different from the first intermediate material. The information provision device is configured to perform position calculations for the positioning terminal only when the results of position calculations can be considered to be successful.