Air-flex® valve extensions make it easy to measure tire pressure. They dont break. They dont wear out and last even in the toughest driving conditions. The Air-flex® extension has a multi-layer construction - a movable stainless steel core. an inner air tube. a stainless steel jacket and a plastic housing. Thanks to the highest quality materials, the Air-flex® extensions are flexible. unbreakable and very durable. At the same time. they are sufficiently rigid and do not require special mounting brackets for installation. Made in Germany.