The backrest is made of high-quality perforated steel plate, formed by stamping and welding, and the surface is treated with spray coating. 

Seat: Made of high-quality multi-layer rotary-cut veneer, formed by hot pressing in a mold and surface-pressed with fireproof board. 

Seat corner code: Made of aluminum alloy by die-casting, with a surface treated by spraying. 

Stand base: Made of aluminum alloy through die-casting, with a surface treated by spraying. 

Writing desk: Particle board surface with melamine veneer, PVC edge banding. 

Bookshelf frame: Made of high-quality cold-drawn steel, with surface treated by electroplating or spraying. 

Balanced structure: Gravity-balanced structure for flipping and placing