Tapes which allow variable information to be filled in by the user, wherein the tape can be torn by hand by the user. The cone extends downwardly from a base to a frustum which forms an opening for depositing coal particles on the grinding table of the pulverizer. A determination of an optimal time for the change is made based on a policy associated with the service. The wall has an inner layer with opposite inner and outer faces and an outer layer with opposite inner and outer faces. The plurality of flexible substrates are drawn into a curved portion and connected to a signal cable at lengthwise different positions respectively in the inside of a flexible tube portion.