Oxygen nasal cannula:

Features:
1) Made of non toxic PVC;
2) Sizes: adult, children, infant;

3) Colors: light green, light blue and transparent;

4) Inside wall: plane or ribbed (reinforced, not easy folded);
5) Slippery surface;

6) Easy operation, non-irritating;

7) Sterile: by EO GAS;

8) Usage: for medical and first aid usage...