Grey Senator Evolve Mesh Back Ergonomic Office Swivel Desk Chairs with loads of Adjustments. 4 Available Price is for each one 
The chairs have a nice big Seat with loads of padding. Lovely Mesh back with an adjustable lumber Bar 
The Chair has a highback for maximum comfort. The Seat, and Arms are  Height Adjustable with a seat depth and 3 position seat tilt adjustment including a front leaning tilt   Arms pads can move forward and back as well as up / Down 
Condition is good  odd very minor fabric mark only and odd mark on Arms . New these around the £700 mark 
These Chairs are built for long hours of comfort sitting. The back has a mesh back and a Perforated back panel 
Approx size is max seat height 55cms seat width between arms is 50cms and seat depth to backrest is 48cms
Please look at my other commercial items