When copying data, it is desired to securely execute data management by preventing violation of rules or leaking out of secret information by administrative error. The present invention also provides methods of manufacture for such composite materials, and methods for their use, for example in forming gypsum board composites. A stepped portion on the lower surface of the circular plate portion is disposed on the outer side of thrust dynamic pressure grooves on the sleeve thrust portion. For example, a budgetary item may be created for \u201chousehold supplies\u201d, \u201cshoes\u201d or \u201cThe Gap\u201d. The nested plates are comprised of an intermediate plate and an outer plate.