medical nasal oxygen cannula Feature : Designed for oxygen delivery and sampling of expired CO2 gases simultaneously . Medical grade clear PVC, non-toxic Latex free 1.The Medical Disposable Nasal Oxygen Cannula is made of clear, medical-grade PVC/plastic dipping 2. Size: Adult & Pediatric XL for adult L for adult M for child S for infant 3.Soft and kink resistant tubing with frosted surface. 4.Ergonomically shaped twin prong nasal tip to ensure equal volume of oxygen to both air passages. 5.Tube length:2m ,or can meet your requrement