GTCHAIR Sync-sliding structure Office Home Ergonomic Task Chair

Specifications and material:  Dimensions: 34.6"×21.7"×26" (W×D×H) Color: black Plastic Shell:Grey PA Engineering Plastics+ glass fiber 30% Aluminum Part: ADC#12 polished strengthen aluminum Back(Headrest) Cover:High elastic Korean Wintex GT Mesh, 13mm super thin back design Lumbar Support: High density foam pad upholstery Seat:High elastic Korean Wintex GT Mesh Armrest:Paddle shift wire control, polished strength aluminum frame with PU cover Mechanism: 60Si2Mn Double Spring Paddle Shift Wire Control Mechanism, Aluminum Shell with texture baking finish, anti-corrosion and abrasion resistant Gas Lift: Customized Korea Samhongsa class IV 85mm drive, load-bearing 250kg Base: BIFMA Certified 350mm ADC12# polished aluminum base with reinforce rib and noise reducing caps inside Casters: BIFMA Certified 65mm black PU casters, rolling test for 100,000 times Bolts: Grade 12.9 hyper-strength bolts in key parts Function: Backrest: Backrest tilt can be locked in 15 positions within 33 degrees b