The Shell chair is one of the most famous Niko Kralj's timeless classics besides the well known MOMA exhibited Rex item. Like all other Shells it's made out of plywood and iron profile with a diameter of 17mm (0.67 inch). This version is a lower lounge version with seat height of 37cm. I have official proof of authenticity such as vintage catalogs, designer records, or other literature sources and take full responsibility for any authenticity issues arising from misattribution