The Tangram chair has a pressed and solid wood frame. Padding in non-deforming fire-resistant polyurethane and springs with elastic belts. Automatic tip-up seat with joints in noise-damping nylon. The backrest panel can be made from veneered wood. Upholstery in Pelle Frau® leather from the Color System, fabric or velvet, using traditional upholstery methods and invisible riveting. Installed in rows using metal bases finished with scratchproof and shock-resistant epoxy powder paint.