Medical venturi mask is a special type of oxygen mask, which will provide several different oxygen concentrations to adapt to the different demands. Venturi mask set consists of a PVC oxygen mask, oxygen tubing and normally 7 colorful diluters, each diluter is made in a special color for a specified oxygen concentration from 24% up to 60%. It is very simple for the caregivers to choose the proper oxygen concentration for the patients easily, so the venturi mask is also hugely demanded in the respiratory departments of the hospitals for oxygen therapy. Product details Medical Venturi Mask Made of medical grade PVC, odorless Size from S/M/L/XL for adult and children With 7 oxygen diluters for concentration from 24%-60% Each packed with an instruction label in a plastic bag.