Schiller Americas 2.100024 Cardboard Mouthpieces for SP-100/SP-110 Flow Sensor Spirometer, Pack of 100, Black (Pack of 100) Go to amazon.com Related posts Top recommendation for spirometer flow FeatureFor schiller sp-100/sp-110 flow sensor spirometerComes with 100 cardboard mouthpiecesHigh efficiency DescriptionCardboard mouthpieces for schiller sp-100/SP-110 flow sensor spirometer. Comes with 100 cardboard mouthpieces.