Pressure sensors that may be used in harsh or corrosive environments. By using fewer pieces of flexible material, less stitching is required, which results in improved performance and ease of manufacture. The method uses polydithiocarbamic compounds in conjunction with a scrubber to capture mercury and reduce its emission andor re-emission with stack gases. Further, the practical commercialization of traction roller transmissions requires improvements in the reliability, ease of shifting, function and simplicity of the transmission. By this arrangement a two-unit system is provided which can be used in a convenient and cost-effective manner. The sheet is formed into a folded box section configuration wherein at least a portion of the first side overlaps a portion of the second side to provide an overlapping portion.