... crush tube,non-toxic PVC,medical grade,flexible. nasal oxygen tube helping breathing oxygen1.Made of non-toxic PVC, ... with 2 connectors to match wide range of respiratory equipment.4.Packed in individual peelable polybag5.Sterilized by ethylene ... tips for your choice8.owing to the keelson design ,oxygen uptake can be never stopped .9.pure color ... ' more comfort Pure PVC Nasal Cannula with oxygen tubing