Hook on the back to hold your phone or hang bag; it also has small compartment to hold solid perfume. The car neck support pillow is made of premium ABS plastic, leather and filled with memory foam for maximum comfort. The car seat head support fits car seats with metal poles width between 2- 7. 9. Quick and easy to install within a few minutes. Both two pads of the car headrest pillow are 180° rotatable, and the spacing between two pads can be adjusted from 5.5-11. The car headrest pillow can comfortably support your neck and head on side, no worrying about hitting your head against your car window.