BIFMA CertificationAll the accessories of our office chair have passed BIFIMA test, which is a guarantee for your personal safety.Our desk chair is constructed of hard-wearing and high breathable nylon mesh , durable star base, solid rolling casters and SGS-certified gas cylinder. The mesh chair can bear the weight of 250lbs. 5 star heavy duty base ,Smooth and durable the PU casters provides great mobility.And protect your floor Easy to AssebleMesh chair with all the hardware and necessary tools. With the installation instruction.Take on the office in about 10-15 minutes! And all parts of the gaming chair are given a number and detailed assembly steps are listed for your reference.