The GUOYOU OC-MB-001 Black Mid-Back Executive Office Chair with Upholstered Seat and Back presents a sleek, professional silhouette defined by a uniform matte black finish and clean, structured lines. The mid-rise backrest aligns with standard executive seating proportions, paired with contoured padding and neatly stitched upholstery seams for a polished, formal appearance that complements refined workspace aesthetics. The chair features fixed T-shaped armrests with flat, supportive pads, paired with a five-point star base that creates a stable, balanced footprint suited to standard desk and meeting table configurations. The chair is upholstered in smooth black faux leather with a fabric backing, stitched with high-strength polyester thread for durable seam integrity. Its seat core uses 45 kg/m³ high-density molded polyurethane foam at 90 mm thickness, while the contoured backrest uses 35 kg/m³ medium-density molded foam with an integrated 80 mm thick padded lumbar panel for targeted lower back support. The internal structure combines a bent plywood support board reinforced with a steel frame, paired with a black steel synchro-tilt mechanism, chrome-plated Class 3 gas lift, glass fiber-reinforced black nylon five-star base, and dual-wheel non-marking polyurethane casters. Fixed armrests are constructed from rigid black polypropylene with integrated padded top surfaces. Core functional features include a 100 mm vertical seat height adjustment operated by a left-side lever, reaching a maximum seat height of 540 mm, a 12-degree backrest tilt with an upright position lock and six-level tension adjustment, full 360-degree swivel rotation, and smooth-rolling casters suitable for hard flooring and low-pile carpet. The fixed integrated lumbar panel provides consistent lower back support, while stationary armrests positioned 200 mm above the seat surface offer stable forearm rest for typing or casual relaxation. The chair is suited for a wide range of professional and personal work settings, including private executive and manager offices as primary task seating, conference rooms for multi-hour meeting use, home office workstations for daily computer work, formal corporate reception areas as visitor seating, and open-plan workspaces for regular full-time employee use. Its understated, professional finish aligns with modern, elegant, and minimalist office decor schemes. For procurement, the chair ships in knock-down flat-pack configuration for efficient shipping, with a 20-foot container holding up to 160 units. Buyers should note that assembly is required, with single-person assembly taking up to 40 minutes using basic tools, and confirm final material specifications, packaging details, and component ratings with the supplier ahead of bulk order placement to align with project requirements.