Return to the office without forgetting a single thing! Buy Office Chair with Headrest Socuéllamos Piqueras y Crespo 840B21C Black and be the envy of your colleagues!. Colour: Black. Structure: PVC. Chair with Armrests: Adjustable. Material: Leggings. Wheel material: Rubber. Seat material: PVC. Backrest: Polyamide. Piston: Gas. Mechanism: Synchro. Maximum seat height: 57 cm. Minimum seat height: 43 cm. Recommended daily hours of use: 8 hours