The ET-DSFB-001 ergonomic office task chair is an unbranded seating solution designed for prolonged seated work, with a streamlined all-black aesthetic anchored by a five-star caster swivel base. Its defining visual feature is the dual-split backrest, paired with fixed loop armrests and a separate contoured lumbar support pad, creating a clean, functional silhouette that suits professional and residential work environments alike. At full assembly, the chair measures 660 mm wide, 660 mm deep, and 1100 mm tall, with a five-star base footprint spanning 700 mm to deliver stable, balanced support during movement. Its construction balances durability and seated comfort through carefully selected materials. The seat is upholstered in 0.8mm thick black woven polyester fabric, layered over 60mm thick, 55 kg/m³ high-density molded polyurethane foam, with a 12mm plywood internal support plate for structural rigidity. The backrest holds 40mm thick, 45 kg/m³ high-resilience polyurethane foam, supported by a frame built from 30% glass fiber reinforced nylon. Fixed loop armrests are formed from injection-molded black polypropylene, while the five-star base uses 3.0mm wall thickness injection-molded black nylon. A Class 4 steel gas lift with 2.5mm wall thickness and 50mm outer diameter connects the seat to the base, fitted with 60mm diameter twin-wheel hard nylon swivel casters. The entire chair weighs 13 kg, with a seat cushion static load capacity of 200 kg and recommended maximum user weight of 150 kg; casters are rated for 100,000 rolling cycles and 1,000 obstacle pass cycles, backed by a 5-year product warranty. Practical functions are tailored to reduce work-related fatigue. A right-side lever controls pneumatic seat height adjustment with 100mm of total travel, reaching a maximum seat height of 520 mm, with fixed armrests positioned 220 mm above the seat for stable forearm support during typing. The synchro-tilt mechanism offers 3 lockable positions, with a maximum 121° recline angle, while full 360-degree horizontal swivel and smooth-rolling casters support easy movement across hard floors and low-pile carpet. The independent dual-split upper back panels relieve pressure on bilateral upper back muscles, while the fixed contoured lumbar pad aligns to the natural lower back curve for consistent support. This chair is suitable for a range of settings, including open plan office workstations for daily long-duration computer work, compact home office spaces for remote work, high-traffic meeting and conference rooms, flexible co-working spaces serving diverse users, and study rooms for students or teleworkers, with a recommended pairing with 2.4 m executive desks. For procurement, note that each unit ships in 2 cartons, with a packaged gross weight of 23 kg per set and total carton volume of 0.26 m³. Assembly takes 40 minutes per unit, and 135 sets can be loaded in a 20GP container at 85% space utilization, supporting bulk order planning for large workspace fit-outs.