Which rule doesn't help classify disassembled spectacle frames and lenses at 8 digits?

Diamond Vision imports eyeglass (spectacle) frames and lenses as disassembled parts into the United States. The frame part is a single molded unit of plastic consisting of rims, a bridge, and a nose piece. The temples and end pieces are also molded plastic and are imported in pairs consisting of one left and one right temple. Steel hinges and screws are imported in boxes. The lenses are plastic and are imported in pairs. Which ONE of the following rules would not apply when determining the eight-digit classification of the spectacle frames and lenses under the HTSUS?