Turbine Starter Pack. Cycling is an incredibly aerobic sport and the Turbine is the perfect means to maximize your performance by increasing your airflow. Turbine is a sports breathing technology designed to fit comfortably inside the nose and gently open each individual nostril to allow more airflow. In fact, the Turbine provides up to 38% more air which may increase your breathing efficiency, aid in performance, and enhance recovery. Simply put, by dilating your nose even slightly you can increase the amount of air going in and also, importantly, increase the amount of exhaust air CO2 you can expel. And, as you know, when you're going hard, every little bit helps. The Turbine Starter Pack is designed for first time users of the device and includes one Turbine in each size small, medium, and large. Each Turbine can be used up to 10 times so you'll have plenty of opportunity to try out different sizes and figure out which works best. Once you determine the correct size you can then purchase the Turbine 3 Pack item TB 3PK which includes three Turbines of the same size.