The present invention is directed to a golf club head with an improved striking surface. 5 and a second insulating film formed to cover the first insulating film and having a relative dielectric constant larger than that of the first insulating film, and a buried wiring formed within the interlayer insulating film. Pilot fuel having a lower autoignition temperature will be ignited by compression ignition, followed by the ignition of the homogeneous mixture of the primary fuel and air. In use, each ink bladder is in fluid communication with a respective channel. In PV cells according to this invention, the nanocrystals may serve both as the light-absorbing material and as the heterojunctions at which excited electron-hole pairs split. The message may be sent directly to the resource administrator station if an urgent need of the end user is indicated, so that a communication may be sent either directly to the end user or to a device driver so that the device driver may communicate the message to the end user.