The KL-05A/B unbranded high-back mesh ergonomic swivel office chair delivers structured, user-centered support for extended seated use across professional and residential settings. It features a tall, contoured backrest upholstered in breathable polyester elastic mesh, with an integrated curved mesh headrest that follows the natural line of the upper spine and neck. The chair sits on a polished electroplated steel five-star base fitted with dual-wheel casters, with softly padded PU armrests positioned at either side of the high-density foam seat to frame the seating position without restricting movement. The matte black finish gives it a streamlined, understated aesthetic that blends with a wide range of interior design schemes. Its construction prioritizes long-term durability and consistent comfort, with a glass-fiber reinforced PA nylon back frame, a 1.5mm thick steel seat base shell, and a 2.0mm thick electroplated steel base. The seat cushion uses molded high-density polyurethane foam for even weight distribution, while the flexible reinforced PP lumbar support structure moves to match seated posture shifts. Armrests are built on rigid PP structural frames topped with soft PU padding, and casters combine a hard-wearing PP core with a smooth polyurethane rolling surface suited to both hard flooring and carpet. Core functional features are designed to accommodate a wide range of user preferences and body types. A pneumatic under-seat lever adjusts seat height to align with standard desk heights, while 360-degree swivel allows easy access to surrounding work surfaces without standing. The backrest reclines to a 130-degree angle with a single-position lock, and a rotary knob lets users adjust tilt tension to match their weight for a personalized feel. Armrests offer vertical height adjustment with a secure fixed-position lock, and the contoured lumbar support moves vertically to target the lower back and reduce fatigue during long periods of seated work. Five dual-wheel casters deliver smooth, quiet movement across common floor surfaces. This chair is well suited for open-plan office workstations supporting 8-hour daily task work, home office spaces for remote work and computer use, conference rooms for multi-hour collaborative meetings, private executive offices for professional individual use, and computer labs or training rooms that demand adjustable, supportive seating for long sessions. For procurement planning, teams should note each unit ships in two cartons, with assembly taking an average of 40 minutes per set. The compact carton dimensions support efficient container loading for large-scale orders, and the chair supports a maximum static load capacity to suit most adult users. There are no brand-specific cosmetic customizations available, making it a consistent, reliable option for bulk furnishing projects that prioritize functional ergonomic support over prominent brand labeling.