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 hard seat of the chair is made of plywood lined with HPL plastic. The basis of a chair the Sphere are equipped with plastic thrust bearings.

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

https://www.bentwood.ru/