1) Middle-class chair back; Patented products.

2) Nylon back frame with adjustable waist support and high rebound mesh;

3) 60-shaped sponge cushion with seat shell;

4) 3D armrest with PU armrest surface;

5) Single handle three-speed locking chassis;

6) 85 # countersunk three-centimeter electroplated steam rod;

7) 330 # aluminum alloy high leg;

8) Silent casters