Feature: 1.Made of malleable aluminum covered with plastic sheath 2.Used to assistant intubation 3.Size available: 6FR,10FR,14FR 4.Size: 6fr/CH suitable for ET tube I.D.2.0-4.5 10fr/CH suitable for ET tube I.D.4.5-6.5 14fr/CH suitable for ET tube I.D.7.0-10.0