Inhaler-5 x 13.5 x 8 booklet- 8 x 9.75" Gauze- 2.25 x 1.5 x 1" Anesthesia, inhalation: Inhaler/mask: Inhaler. The head unit contains a rubber covered metal mouthpiece, nose cover, exhaling valve, valve containing Somnoform and air, capsule chamber and rubber bag." Device would fit over the head and nose of the patient with the bag sitting behind the head of the patient. Somnoform (60% ethyl chloride, 35% methyl chloride and 5% ethyl bromide) was used to anaesthetize patients during dental surgery. An illustrative booklet came with the set.