By eliminating the screws on the back we achieved a much slimmer and elegant look but also managed to make the chair more stable than the screw-fastened ones. By keeping the slides in the same width with the frame not only did we make it easier to store it, as the chair when folded is very slim, but also it is safer as it prevents the fingers to be jammed between the frame tubes. Finally, the unique U-shaped seat-tube design economizes time and production cost and still remains stable and safe to use. This cost reduction is reflected to our selling price so more customers will be able to afford excellent quality in reasonable price.