Nasal cannulas are medical devices used when people are unable to get sufficient oxygen to keep their body functioning optimally. In our company, there are four types can be choosed, which are: Straight nasal prongs ,Straight nasal prongs ,Flared nasal prongs and Soft nasal prongs (dipping) . Web:www.nasalendotracheal.com Whatsapp: 0086 158 9016 9579