Neck guard chair cushion $ 19.16 About fragments: The backrest thickness is less than 2cm, suitable for 2cm fixing clips The thickness of the backrest is between 2-2.4 cm, suitable for 2.6 cm fixing clips The backrest thickness is less than 2.4-3cm, suitable for 3cm fixing clips advice: The product can be lifted up and down, and the headrest can be turned over. 2. This product can relieve your cervical spine pressure. Due to manual measurement, there may be some errors, please understand. Thank you. If there is a sponge on the backrest, please measure the thickness of the backrest after pressing. If the backrest sponge is too thick, it cannot be installed with fixing clips.