A production method of an insulating film forming composition includes a process of filtering a composition through a filter made of polyethylene or nylon. Synchronization polices specify files to be synchronized based on selected criteria including file data, metadata, and location information. In the methods of the present invention, no etch step is required to form the air gaps. Multiple user devices can also be coordinated to simultaneously flash or activate other light emitting components that may improve lighting condition than would otherwise be capable of a single computing device. In a radio wave absorbent in which magnetic particles comprising a soft magnetic metal material are mixed with a matrix of a polymeric material or ceramics, the magnetic particles are formed into elliptic plate particles.