Rossmax Aero Spacer + Child MaskSpacers are clear plastic cylinders which are used with a MDI, Metered Dose Inhaler, or more commonly known as an asthma pump. The Rossmax Aero Spacer makes it easier to inhale the medication from the MDI, as well as increases the effectiveness of the delivery of medication from the pump. Instead of inhaling directly from the MDI, a dose from the MDI is puffed into the spacer and then inhaled via the mask of the spacer. The benefits of this are two