This Black Modern Mid-Back Ergonomic Mesh Office Desk Chair with Armrest on Wheels comes with all hardware & necessary tools. Follow the desk chair instruction, you'll find it easy to assemble, and the computer chair estimated assembly time in about 10-15 mins. Desk chair using high-density sponge cushion, more flexible, office chair with a middle back design, rectangular ornament not only as a decoration, it can provide good lumbar support makes you feel comfortable. All the accessories of our