The Sphere chair is made of a steel pipe with a diameter of 30 mm. Chair frame can be powder coated in 9 standard colours. The seat of the chair can be upholstered in any fabric of your choice. The basis of a chair the Sphere is equipped with plastic thrust bearings.
Country of origin: Russia

https://www.bentwood.ru/catalog/stulya_main/metallokarkas-s/stul_sfera_myagkiy/ 

https://www.bentwood.ru/