These corrugated Breathing Tubes are manufactured of black conductive neoprene with natural rubber cuff inserts and are produced by the dipping process. Our neoprene Adult Breathing Tubes are available in two lengths with 22mm cuff inserts. We also have two sizes of Pediatric Breathing Tubes which incorporate a 22mm cuff insert at the anesthesia machine end and a 15mm straight cuff at the patient end for use with appropriate 15mm tube fittings.