Material of Car Glass Breaker: This 2 in 1 emergency window breaker and seatbelt cutter has a built-in high-pressure spring and sturdy tungsten steel blade that instantly shatters solid window glassDurable & Reliable Window Breaker Seatbelt Cutter: JING - HELPER glass breaker & seatbelt cutter is a durable tool to help you in an emergency. Allows you to get out of your vehicle quickly if you needVersatile and Portable Glass Breaker and Seatbelt Cutter: This car window breaker is suitable for rescue, escape and any unexpected situations. The window breaker seatbelt cutter are compact and portable enough to carry wherever you goEasy to Use Window Breaker: The car window breaker tool is designed to break tempered glass windows, allowing for a safe and quick exit from the vehicle. Simply align the U-shaped mouth of the cutter with the seat belt, push it forward quickly, and escape easily without hurting your handsNote of the Breaker: Only the tempered glass of the side windows of the car can be broken, and the laminated glass such as the front and rear windshield sunroofs cannot be broken