Oxygen Mask 100 Pack – Adult Medium Concentration Bulk pack of 100 adult masks. £495.00 Oxygen Mask 100 Pack - Adult Medium Concentration quantity Add to basket Description Bulk pack of 100 adult, medium concentration masks. You might also like Oxygen Mask Adult Medium Concentration £4.95 Add to basket Oxygen Mask 40 Pack – Adult Medium Concentration £198.00 Add to basket Oxygen Mask 80 Pack – Adult Medium Concentration £396.00 Add to basket