What's in the box? 1.Backrest (built-in lumbar support) 2.Seatbase with Armrests (Pre-installed) 3.Aluminium Wheel Base 4.Screw Kit (with 2 more spare screws) 5.Magnetic Head Pillow 6.Height Adjustment Tilt Lever Handle 7.Tilt Lock Lever Handle 8.Magnetic PU Foam Armrest Tops*2 9.Gas Piston 10.Piston Dust Cover 11.Magnetic Side Covers*2 12.Multi-Function Tilt Mechanism 13.Casters (Wheels)*5 14.Safety Cap