Mid-Back Ergonomic Office Chair with Lumbar Support, Gray

• Model No.: B660-DG
• Color: Dark Gray
• Material: PU Leather+Sponge
• Size: W640*D650*H970-1055 MM
• 【SUPPLE MICROFIBER LEATHER & DENSE Sponge】 Covered in high-grade beige microfiber leather that combines smooth texture with superior wear resistance and low-maintenance convenience. Filled with high-resilience polyurethane Sponge (≥40kg/m³) that maintains its shape and springiness through rigorous daily work.
• 【ANATOMICAL LUMBAR SUPPORT & 2-POINT ARMRESTS】 Features an extra-wide flexible lumbar support designed to match the natural curve of the human spine, relieving waist strain during long hours of sitting. Integrated two-point PP+GF armrests offer smooth, ergonomic support for wrists and arms.
• 【POLISHED STEEL BASE & BIFMA SAFETY CERTIFIED】 Equipped with a sleek 350mm radius electroplated steel base featuring robotic CNC welding and 360° polishing for anti-rust durability. Easily passes BIFMA X5.1-2017 static pressure tests (1,300kg static load for 1 min twice without breaking).
• 【TILT MECHANISM】 Driven by a heavy-duty 2.5mm cold-rolled steel tilt mechanism allowing tilting and initial-position locking (passed BIFMA 120,000-cycle back-pull tests). The seat features a 12mm 9-ply solid wood plywood inner core for superior stability and eco-safety.
• 【SAFE GAS LIFT & QUIET MOBILITY】 Equipped with a Class-3 explosion-proof safety gas cylinder (85mm travel) filled with nitrogen gas (6-8MPa). Rolls quietly and effortlessly on soft PU-rimmed casters that protect hardwood and delicate flooring.

SPECIFICATIONS