Material: This stop button was made from high quality ABS, durable, strong, strong and corrosion resistant, flame retardant, insulation Function:Prevent seat belt buckle from sliding down. Design: The seat belt anti slip buckle is divided into two parts/halves, one half has a pin and the other half has a hole. Easy to install, just clip front and back buttons together. Universal: These safety belt stop buttons fit any car, truck or SUV seat belt.