Adjustable Venturi mask Made of Medical grade PVC Adjustable nose cilp Oxygen concentration is blue 24%,yellow 28%, white 31%,green 35%,pink 40%,orange 50%. With elastic strap With 2m tubing Size available:S,M,L,L,L+,XL packed in individual pe packing 50pcs/ctn oc 100pcs/ctn