ID (mm): 8.0 mm.OD (mm): 10.9 mm.Length (mm): 74.0 mm.Clearly the softer choice in a flexible disposable inner cannula system.The Portex flexible disposable inner cannula tracheostomy tubes are constructed of siliconized polyvinyl chloride, providing a softer and more pliable tube to reduce risk of tracheal trauma.Built-in 15 mm ISO termination for easy ventilator circuit attachment with or without inner cannula in place.Cuffed Flex D.I.C. tubes come with a Soft-Seal cuff, providing a high volume, low-pressure seal that reduces the potential for patient trauma.Color-coding throughout the D.I.C. line enables caregivers to quickly identify and size tubes and related inner cannula.Snap-in obturator makes placement of tube safe and easy.Flex D.I.C. tracheostomy tubes come with an obturator, Velcro trach tube holder, and one color-coded inner cannula. Water Capacity: 1 1/3 cups (325 ml / 11 oz) Dimensions Approximate: 8.25" x 6.25" x 2.75"