The present invention relates to wood pulp for glass plate-interleaving paper in which an amount of silicone contained in the wood pulp is 0. Constituent features of the part are formed by 3-D printing. At least one transistor configuring the operating circuit is a partially-depleted SOI field-effect transistor in which a body region is in an electrically floating state. The client transmits item selections to the server where an inventory including a list of the items, their cumulative weight and volume is calculated based on stored data which includes standardized or customized weights and volumes for the items selected. An offset taking place in a tracking error signal and focus error signal is removed to accurately control the tracking and focus of an optical head.