Chairs collection Ray Soft from the company Brunner Footbase base (on wheels, adjustable). In three versions: low, medium and high back. The base is presented in three colors: aluminum, black and white.

Links to the manufacturer's website / store:
Low back: https://www.brunner-group.com/en-DE/products/details/ray-soft_9619/A/ 
Medium back: https://www.brunner-group.com/en-DE/products/details/ray-soft_9629/A/ 
High back: https://www.brunner-group.com/en-DE/products/details/ray-soft_9639/A/ 

On the seat applied modifier TurboSmooth. For all models, a sweep.