The Adult Oxygen Mask from Roscoe is designed for patient comfort as it features a soft, anatomical shape for the best fit possible. Once securely in place, barbed fittings help prevent the patient from disconnecting the mask. Elastic straps help the mask stay in place as well as ensure a better fit. The mask is a medium-concentration oxygen mask, delivering an oxygen concentration of 40% to 50% depending on the patient's breathing rate and tidal volume. With the mask, this set includes 7' of tubing. The tubing is clear and crush-resistant, providing a safe, uninterrupted flow of oxygen. The 7' of tubing, when uncoiled, lies out straight, minimizing "torque" or pull and letting users have a little bit of mobility as the tubing tracks with them. This is 1 case of mask and tube sets and 50 sets come in each case. The universal connector at the end of the tubing comes standard. Tubing features a six-channel inner lumen design offering an uninterrupted flow of oxygen that provides maximum safety. Working in tandem with the straps, the mask features adjustable aluminum nose clips to ensure the mask is fitted properly and stays on. This mask is intended for single patient use and should not be washed and reused. Roscoe masks and tubing are all Latex-free.