SIHOO offers users with high-quality products and wonderful experiences, we have set up a leading Sihoo Institute of Engineering and built a whole industrial chain system integrating design, manufacturing, marketing, quality testing, storage, transportation and installation. We stand behind our products and built up a good relationship with all our customer all over the world. SIHOO M80C series office chair features: 1. Adjustable Headrest, backrest, armrests, seat height. 2. Breathable and comfortable seat cushion 3. Noise free on different kinds of floor 4. Wide usage for work, study, releax, gaming 5. Pass SGS testing, enviromental material SIHOO M80C series office chair packages: 1. One chair with all parts 2. Installation tools 3. User manual 4. Pair of protection glove