Feature:3 SIZES OF FIXING CLIPThe office chair back has 3 different fixing clip sizes for you to choose. Their inner diameters are about 2.2cm/0.87inch, 2.6cm/1.02inch, 3cm/1.18inch, please confirm the size of the seat back before purchasing.STURDY MATERIALOffice chair headrest is made of sponge + 3D fiber mesh, it is soft, can effectively cushion and absorb pressure. Its back as well as the support rod is made of plastic material, featuring high strength, durable.ADJUSTABLE HEIGHT AND ANGLEThe height and elevation of the headrest can be adjusted, and the height can be increased by about 4cm/1.57inch. You can adjust as needed.NECK PROTECTIONThe heightened accessory of the office computer chair is ergonomically designed, makes your chair more comfortable, and protects your neck and spine.NO PUNCHINGEquipped with screw bag, no punching design, easy to install. The fixing clip is thickened and deepened and the mounting holes are reinforced, making the headrest more stable.Specifications:Type: A (inner diameter of clip 2.2cm), B (inner diameter of clip 2.6cm), C (inner diameter of clip 3cm)Color: BlackMaterial: Plastic+sponge+meshSize: About 28 x 18 x 18-22 x 7cm/11.02 x 7.09 x 7.09-8.66 x 2.76inch(headrest length x headrest width x adjustable height x installation head length)Package Includes:1pc x Office chair headrest1pc x Mounting screw packNote:1. Due to the light and screen difference, the item& 039;s color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.3. It is not suitable to install office chairs with unevenness, round pipes, and thick back-to-back sponges.4. The office chair is not included.