There is disclosed a reusable shipping pallet formed from plastic parts and a method of assembling the same. The device also includes switching elements, heaters, stack patterns, top electrodes, bit lines, word line contacts and word lines. A peripheral face of the assembly of substantially quadrangular-cross-section units has a concave portion and a convex portion formed in a substantially step-shaped pattern. A developing device for use in an image forming apparatus includes the stopper configured as described above to be fitted to its developer filling port. The GPU determines the number of tiles in each array by calculating the maximum of the depth complexity associated with the pixels in the pixel group represented by the array and creates a corresponding prefix sum image to allow the GPU to efficiently locate the array associated with a given pixel group in the A-Buffer for addressing purposes. By the present invention an anilox roll, typically used in the printing industry, has a sterilant, such as hydrogen peroxide, imbedded within the microscopic pores formed on the cylindrical surface of the roll after which the paperboard material subjected to rolling contact with the roll whereby the sterilant is uniformly applied to the paperboard thereby sterilizing the surface of the paperboard.