Descriptions:Product size: 3.8"x2"x1.1"Material:ABS & siliconeWeight: 36 g/pcsUsing Guide:1. Place the car seat headrest lift up slightly, exposing the connecting rod2. The hook fixedly mounted connecting rodNote:1. Don not support using this hook for integrated headrests2. Do not install where can affect the airbags and prejudice affect posture places3. Do not install the front of child seat4. Do not hang into the precious or fragile items because the hook may be falled off during fast driving or vibration