PU silent casters, low moving noise. Using die-casting to form a five-star foot, which is higher than the BIFMA test standard. The curved headrest design fits the curve of the cervical spine; it can be adjusted up and down, suitable for people of different heights. Three-stage locking of the chassis, material: steel plate, durable, no interference in mechanism movement, no noise. The back tilt force is precise and even. Double-shaped lumbar support, micro-elastic creative support, slightly adjust the direction according to the strength, can be adjusted up and down, and adjusted to a suitable lumbar position. The chassis has a three-speed locking function, keeping the back straight in the working state, and locking backwards in the resting state. High-quality mesh, strong tensile, abrasion resistance, air permeability, anti-static properties, excellent color and labor resistance. The whole chair body can be rotated 360°, the chair body can be adjusted up and down, and the headrest can be adjusted up and down.