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【Ergonomic Office Chair】: - Innovative Adjustable Backrest: Our ergonomic office chair features a unique adjustable knob. Simply move the backrest back and forth to provide perfect lumbar support and ensure a flexible, high-back experience. - 3D Armrests and Adjustable Headrest: Protect your spine and maintain comfortable postures with our 3D armrests and adjustable headrest. These features are designed to keep you comfortable all day long.