The thresholds are made of professional, extremely light and durable PU material. Contrary to laminate, PU is resistant to mechanical damage and weather conditions (PU is more flexible and durable than ABS). Very easy to assemble and paint. All elements are flexible, they can be stretched or bent and they will return to their shape. excellent vibration damping resistant to weather conditions The thresholds are made of professional, extremely light and durable PU material. Contrary to laminate, PU is resistant to mechanical damage and weather conditions (PU is more flexible and durable than ABS). Very easy to assemble and paint. All elements are flexible, they can be stretched or bent and they will return to their shape. excellent vibration damping resistant to weather conditions