Merax Big and Tall Back Ergonomic Racing Style Adjustable Chair Executive Office Chair, YellowTall and Big ATTENTIONThere are 2 colors of wheels for the chairblack and silver with the same qualityas the picture shows, which will be shipped randomly. Both are authentic,hope you understand 360 Degree Swivel | Smoothly Height Adjustable | Ergonomic back and head support | Smooth rocker mechanism | Integrated tilt function mechanism Lie down the backrest easily by pressing one button, and 180 degree lie down design Extremely soft thick padding upholstery for superior comfort Ergonomically designed for comfort for those who work at desks for long periods