Built to Last: The five-star base (70 cm diameter) passed a supplier-tested static pressure test of 1136 kg for 1 minute without breaking. The office chair has a maximum support capacity of 150 kg (self-tested), providing stable and reliable support A Safe Seat: The auto-return cylinder has passed the SGS safety test with 120,000 cycles, (Certificate No.: AJH23293938, holder: supplier). This office chair will last for years Ergonomically designed structure - With body type radian, adjustable overall height from 114 to 124 cm, backrest height about 76 cm, Seat: width 55 cm, depth 50 cm, the seat surface to ground height about 46 to 56 cm,handrail to ground height about 68 to78 cm, 360 degree rotation and shake back and forth Heavy-Duty and Smooth Castors: Made of high-quality PU material, the castors have been tested 100,000 times to ensure their wear resistance (supplier-tested). The castors roll smoothly and noiselessly, helping you remain productive at work Spare parts - Use anti-loose screws prevent loosening after prolonged use, additional screws and wheels are provided as backup